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US4854410A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of incorporating four-wheel steering system in vehicle and four-wheel steering system

Assignee: Mazda Motor Corp
•
Filing: 1988-02-22
•
Granted: 1989-08-08
•
Expires: 2008-02-22
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Abstract

Abstract A four-wheel steering system has a front wheel turning mechanism for turning front wheels in response to operation of a steering wheel, a rear wheel turning mechanism for turning rear wheels, a controller for controlling the rear wheel turning mechanism to turn the rear wheels according to preset four-wheel steering characteristics and a relay shaft which is connected to the controller to transmit turning of the front wheels to the controller. The front wheel turning mechanism and the rear wheel turning mechanism are caused to bring the front wheels and the rear wheels to the respective straight-ahead positions while the relay shaft is disconnected from the controller. Then the controller is brought into the state corresponding to the straight-ahead positions of the front and rear wheels on the basis of the preset four-wheel steering characteristics. Thereafter, the relay shaft is connected to the controller.

Inventors

  • 👤 Hirotaka Kanazawa
  • 👤 Koushun Note
  • 👤 Yasuhiro Nakashima
  • 👤 Yoshiaki Mukai
  • 👤 Shunji Sakamoto
  • 👤 Shigeo Okamizu

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 23:54
CPC Classifications
B; B62; B62D; B62D7/00; B62D7/06; B62D7/14; B62D7/15; B62D7/1518; B62D7/1545

Claims Analysis

Total Claims: 40
Claim 1
Independent Claim 209 words
A method of incorporating in a vehicle a four-wheel steering system having a front wheel turning mechanism for turning front wheels in response to operation of a steering wheel, a rear wheel turning mechanism for turning rear wheels, a control means for controlling the rear wheel turning mechanism to turn the rear wheels according to preset four-wheel steering characteristics and a connecting means which is connected to the control means to transmit front wheel turning information to the control means, thereby operatively connecting the front wheel turning mechanism with the rear wheel turning mechanism, comprising the steps of causing the front wheel turning mechanism and the rear wheel turning mechanism to bring the front wheels and the rear wheels to respective reference positions while the connecting means is operatively disconnected from the control means, bringing the control means into a reference state, and connecting the connecting means to the control means, the reference position of the front wheels and the reference position of the rear wheels corresponding to each other on the basis of the preset four-wheel steering characteristics, the reference state of the control means being a state corresponding to the reference positions of the front and rear wheels on the basis of the preset four-wheel steering characteristics.
Claim 2
Independent Claim 209 words
A method of incorporating in a vehicle a four-wheel steering system having a front wheel turning mechanism for turning front wheels in response to operation of a steering wheel, a rear wheel turning mechanism for turning rear wheels, a control means for controlling the rear wheel turning mechanism to turn the rear wheels according to preset four-wheel steering characteristics and a connecting means which is connected to the control means to transmit front wheel turning information to the control means, thereby operatively connecting the front wheel turning mechanism with the rear wheel turning mechanism, comprising the steps of causing the front wheel turning mechanism and the rear wheel turning mechanism to bring the front wheels and the rear wheels to respective reference positions while the connecting means is operatively disconnected from the control means, bringing the control means into a reference state, and connecting the connecting means to the control means, the reference position of the front wheels and the reference position of the rear wheels corresponding to each other on the basis of the preset four-wheel steering characteristics, the reference state of the control means being a state corresponding to the reference positions of the front and rear wheels on the basis of the preset four-wheel steering characteristics.
Claim 3
Dependent Claim 23 words
A method as defined in claim 1 in which the reference positions of the front and rear wheels are the respective straight-ahead positions.
Claim 4
Independent Claim 224 words
A method of incorporating in a vehicle a four-wheel steering system having a front wheel turning mechanism for turning front wheels in response to operation of a steering wheel, a rear wheel turning mechanism for turning rear wheels, a control means for controlling the rear wheel turning mechanism to turn the rear wheels according to preset four-wheel steering characteristics and a connecting means which is connected to the control means to transmit front wheel turning information to the control means, thereby operatively connecting the front wheel turning mechanism with the rear wheel turning mechanism, comprising the steps of causing the front wheel turning mechanism and the rear wheel turning mechanism to bring the front wheels and the rear wheels to respective reference positions while the connecting means is operatively disconnected from the control means, bringing the control means into a reference state, connecting the connecting means to the control means, and mechanically transmitting the front wheel turning information to the control means by the connecting means, the reference position of the front wheels and the reference position of the rear wheels corresponding to each other on the basis of the preset four-wheel steering characteristics, the reference state of the control means being a state corresponding to the reference positions of the front and rear wheels on the basis of the preset four-wheel steering characteristics.
Claim 5
Independent Claim 224 words
A method of incorporating in a vehicle a four-wheel steering system having a front wheel turning mechanism for turning front wheels in response to operation of a steering wheel, a rear wheel turning mechanism for turning rear wheels, a control means for controlling the rear wheel turning mechanism to turn the rear wheels according to preset four-wheel steering characteristics and a connecting means which is connected to the control means to transmit front wheel turning information to the control means, thereby operatively connecting the front wheel turning mechanism with the rear wheel turning mechanism, comprising the steps of causing the front wheel turning mechanism and the rear wheel turning mechanism to bring the front wheels and the rear wheels to respective reference positions while the connecting means is operatively disconnected from the control means, bringing the control means into a reference state, connecting the connecting means to the control means, and mechanically transmitting the front wheel turning information to the control means by the connecting means, the reference position of the front wheels and the reference position of the rear wheels corresponding to each other on the basis of the preset four-wheel steering characteristics, the reference state of the control means being a state corresponding to the reference positions of the front and rear wheels on the basis of the preset four-wheel steering characteristics.
Claim 6
Dependent Claim 30 words
A method as defined in claim 3 further comprising a step of adjusting toe-in of the front and rear wheels after the connecting means is connected to the control means.
Claim 7
Dependent Claim 44 words
A method as defined in claim 4 further comprising the steps of temporarily locking the control means to the reference state before connecting the connecting means to the control means, and releasing the control means after connecting ,the connecting means to the control means.
Claim 8
Dependent Claim 72 words
A method as defined in claim 3 further comprising a step of adjusting toe-in of the front and rear wheels after the steps of causing the front wheel turning mechanism and the rear wheel turning mechanism to bring the front wheels and the rear wheels to the respective reference positions and bringing the control means into a reference state, and before the step of connecting the connecting means to the control means.
Claim 9
Dependent Claim 50 words
A method as defined in claim 6 further comprising the steps of temporarily locking the control means to the reference state before the step of adjusting toe-in of the front and rear wheels and releasing the control means after the step of connecting the connecting means to the control means.
Claim 10
Independent Claim 224 words
A method of incorporating in a vehicle a four-wheel steering system having a front wheel turning mechanism for turning front wheels in response to operation of a steering wheel, a rear wheel turning mechanism for turning rear wheels, a control means for controlling the rear wheel turning mechanism to turn the rear wheels according to preset four-wheel steering characteristics and a connecting means which is connected to the control means to transmit front wheel turning information to the control means, thereby operatively connecting the front wheel turning mechanism with the rear wheel turning mechanism, comprising the steps of causing the front wheel turning mechanism and the rear wheel turning mechanism to bring the front wheels and the rear wheels to respective reference positions while the connecting means is operatively disconnected from the control means, bringing the control means into a reference state, connecting the connecting means to the control means, and electrically transmitting the front wheel turning information to the control means by the connecting means, the reference position of the front wheels and the reference position of the rear wheels corresponding to each other on the basis of the preset four-wheel steering characteristics, the reference state of the control means being a state corresponding to the reference positions of the front and rear wheels on the basis of the preset four-wheel steering characteristics.
Claim 11
Independent Claim 224 words
A method of incorporating in a vehicle a four-wheel steering system having a front wheel turning mechanism for turning front wheels in response to operation of a steering wheel, a rear wheel turning mechanism for turning rear wheels, a control means for controlling the rear wheel turning mechanism to turn the rear wheels according to preset four-wheel steering characteristics and a connecting means which is connected to the control means to transmit front wheel turning information to the control means, thereby operatively connecting the front wheel turning mechanism with the rear wheel turning mechanism, comprising the steps of causing the front wheel turning mechanism and the rear wheel turning mechanism to bring the front wheels and the rear wheels to respective reference positions while the connecting means is operatively disconnected from the control means, bringing the control means into a reference state, connecting the connecting means to the control means, and electrically transmitting the front wheel turning information to the control means by the connecting means, the reference position of the front wheels and the reference position of the rear wheels corresponding to each other on the basis of the preset four-wheel steering characteristics, the reference state of the control means being a state corresponding to the reference positions of the front and rear wheels on the basis of the preset four-wheel steering characteristics.
Claim 12
Dependent Claim 33 words
A method as defined in claim 8 further comprising a step of electrically matching the connecting means with the control means before the step of connecting the connecting means with the control means.
Claim 13
Dependent Claim 30 words
A method as defined in claim 9 further comprising a step of adjusting toe-in of the front and rear wheels after the connecting means is connected to the control means.
Claim 14
Dependent Claim 44 words
A method as defined in claim 10 further comprising the steps of temporarily locking the control means to the reference stat before connecting the connecting means to the control means, and releasing the control means after connecting the connecting means to the control means.
Claim 15
Dependent Claim 84 words
A method as defined in claim 9 further comprising a step of adjusting toe-in of the front and rear wheels after the steps of adjusting toe-in of the front and rear wheels after the steps of causing the front wheel turning mechanism and the rear wheel turning mechanism to bring the front wheels and the rear wheels to the respective reference positions and bringing the control means into a reference state, and before the step of connecting the connecting means to the control means.
Claim 16
Dependent Claim 50 words
A method as defined in claim 12 further comprising the steps of temporarily locking the control means to the reference stat before the step of adjusting toe-in of the front and rear wheels and releasing the control means after the step of connecting the connecting means to the control means.
Claim 17
Dependent Claim 166 words
A four-wheel steering system comprising a front wheel turning mechanism for turning front wheels in response to operation of a steering wheel, a rear wheel turning mechanism for turning rear wheels in response to turning of the front wheels, and a rotatable relay shaft which transmits the amount of turning of the front wheels to the rear wheel turning mechanism, characterized in that the rear wheel turning mechanism comprises a rear wheel turning rod which extends in the transverse direction of the vehicle body and is movable in the direction of the vehicle body to turn the rear wheels respectively connected to the left and right ends thereof by way of wheel supports, a control means which controls the rear wheel turning rod according to the amount of turning of the front wheels transmitted thereto through a rotatable input shaft connected to the relay shaft by way of a connecting means, and a locking means which is adapted to prevent rotational displacement of the input shaft.
Claim 18
Dependent Claim 166 words
A four-wheel steering system comprising a front wheel turning mechanism for turning front wheels in response to operation of a steering wheel, a rear wheel turning mechanism for turning rear wheels in response to turning of the front wheels, and a rotatable relay shaft which transmits the amount of turning of the front wheels to the rear wheel turning mechanism, characterized in that the rear wheel turning mechanism comprises a rear wheel turning rod which extends in the transverse direction of the vehicle body and is movable in the direction of the vehicle body to turn the rear wheels respectively connected to the left and right ends thereof by way of wheel supports, a control means which controls the rear wheel turning rod according to the amount of turning of the front wheels transmitted thereto through a rotatable input shaft connected to the relay shaft by way of a connecting means, and a locking means which is adapted to prevent rotational displacement of the input shaft.
Claim 19
Dependent Claim 41 words
A four-wheel steering system as defined in claim 14 in which the control means comprises a hydraulic actuator for driving the rear wheel turning rod and a controller which controls the hydraulic actuator according to the displacement of the input shaft.
Claim 20
Dependent Claim 18 words
A four-wheel steering system as defined in claim 14 in which the connecting means comprises a universal joint.
Claim 21
Independent Claim 223 words
A method of incorporating in a vehicle a four-wheel steering system having a front wheel turning mechanism for turning front wheels in response to operation of a steering wheel, a rear wheel turning mechanism for turning rear wheels in response to turning of the front wheels according to preset four-wheel steering characteristics, and a rotatable relay shaft which transmits the amount of turning of the front wheels to the rear wheel turning mechanism, the rear wheel turning mechanism including a rear wheel turning rod which extends in the transverse direction of the vehicle body to turn the rear wheels respectively connected to the left and right ends thereof by way of wheel supports, a control means which controls the rear wheel turning rod according to the amount of turning of the front wheels transmitted thereto through a rotatable input shaft connected to the relay shaft by way of a connecting means, and a locking means which is adapted to prevent rotatable displacement of the input shaft, comprising the steps of effecting adjustment of the front wheels and the rear wheels while the input shaft is disconnected from the relay shaft and locked by the locking means, subsequently connecting the input shaft with the relay shaft by way of the connecting means, and releasing the lock of the input shaft by the locking means.
Claim 22
Independent Claim 223 words
A method of incorporating in a vehicle a four-wheel steering system having a front wheel turning mechanism for turning front wheels in response to operation of a steering wheel, a rear wheel turning mechanism for turning rear wheels in response to turning of the front wheels according to preset four-wheel steering characteristics, and a rotatable relay shaft which transmits the amount of turning of the front wheels to the rear wheel turning mechanism, the rear wheel turning mechanism including a rear wheel turning rod which extends in the transverse direction of the vehicle body to turn the rear wheels respectively connected to the left and right ends thereof by way of wheel supports, a control means which controls the rear wheel turning rod according to the amount of turning of the front wheels transmitted thereto through a rotatable input shaft connected to the relay shaft by way of a connecting means, and a locking means which is adapted to prevent rotatable displacement of the input shaft, comprising the steps of effecting adjustment of the front wheels and the rear wheels while the input shaft is disconnected from the relay shaft and locked by the locking means, subsequently connecting the input shaft with the relay shaft by way of the connecting means, and releasing the lock of the input shaft by the locking means.
Claim 23
Dependent Claim 31 words
A method as defined in claim 17 in which the adjustment of the front wheels and the rear wheels is adjustment of toe of the front wheels and the rear wheels.
Claim 24
Dependent Claim 144 words
A method as defined in claim 17 further comprising the steps of causing the front wheel turning mechanism and the rear wheel turning mechanism to bring the front wheels and the rear wheels to respective reference positions and bringing the control means into a reference state, while the input shaft is disconnected from the relay shaft and released from the locking means, and subsequently locking the input shaft by the locking means before the step of effecting adjustment of the front wheels and the rear wheels, the reference position of the front wheels and the reference position of the rear wheels corresponding to each other on the basis of the preset four-wheel steering characteristics, the reference state of the control means being a state corresponding to the reference positions of the front and rear wheels on the basis of the preset four-wheel steering characteristics.
Claim 25
Dependent Claim 31 words
A method as defined in claim 19 in which the adjustment of the front wheels and the rear wheels is adjustment of toe of the front wheels and the rear wheels.
Claim 26
Dependent Claim 202 words
A four-wheel steering system comprising a front wheel turning mechanism for turning front wheels in response to operation of a steering wheel, a rear wheel turning mechanism for turning rear wheels in response to turning of the front wheels, and a relay shaft which transmits the amount of turning of the front wheels to the rear wheel turning mechanism, characterized in that the said rear wheel turning mechanism comprises a rear wheel turning rod which extends in the transverse direction of the vehicle body and is movable in the direction of the vehicle body to turn the rear wheels respectively connected to the left and right ends thereof by way of wheel supports, a means for urging the rear wheel turning rod to a neutral position in which the rear wheel turning rod supports the rear wheels in the respective straight-ahead positions, a hydraulic actuator which displaces the rear wheel turning rod in the transverse direction of the vehicle body from the neutral position, a control means which controls the hydraulic actuator according to the amount of turning of the front wheels transmitted thereto through the relay shaft, and a locking means which is adapted to prevent operation of the control means.
Claim 27
Dependent Claim 202 words
A four-wheel steering system comprising a front wheel turning mechanism for turning front wheels in response to operation of a steering wheel, a rear wheel turning mechanism for turning rear wheels in response to turning of the front wheels, and a relay shaft which transmits the amount of turning of the front wheels to the rear wheel turning mechanism, characterized in that the said rear wheel turning mechanism comprises a rear wheel turning rod which extends in the transverse direction of the vehicle body and is movable in the direction of the vehicle body to turn the rear wheels respectively connected to the left and right ends thereof by way of wheel supports, a means for urging the rear wheel turning rod to a neutral position in which the rear wheel turning rod supports the rear wheels in the respective straight-ahead positions, a hydraulic actuator which displaces the rear wheel turning rod in the transverse direction of the vehicle body from the neutral position, a control means which controls the hydraulic actuator according to the amount of turning of the front wheels transmitted thereto through the relay shaft, and a locking means which is adapted to prevent operation of the control means.
Claim 28
Dependent Claim 26 words
A four-wheel steering system as defined in claim 21 in which said control means is connected with the relay shaft by way of a universal joint.
Claim 29
Dependent Claim 35 words
A four-wheel steering system as defined in claim 21 which said control means comprises and input shaft connected to the relay shaft and said locking means is adapted to prevent displacement of the input shaft.
Claim 30
Dependent Claim 34 words
A four-wheel steering system as defined in claim 23 in which the locking means comprises a bolt which is adapted to be screwed into a bolt hole to be engaged with the input shaft.
Claim 31
Dependent Claim 186 words
A four-wheel steering system comprising a front wheel turning mechanism for turning front wheels in response to operation of a steering wheel, a rear wheel turning mechanism for turning rear wheels in response to turning of the front wheels, and a relay shaft which transmits the amount of turning of the front wheels to the rear wheel turning mechanism, characterized in that the rear wheel turning mechanism comprises a rear wheel turning rod which extends in the transverse direction of the vehicle body and is movable in the direction of the vehicle body to turn the rear wheels respectively connected to the left and right ends thereof by way of wheel supports, a control means which controls the rear wheel turning rod according to the amount of turning of the front wheels transmitted thereto through an input shaft connected to the relay shaft by way of a connecting means, and a locking means which is adapted to prevent displacement of the input shaft, the locking means comprising a bolt which is adapted to be screwed into a bolt hole to be engaged with the input shaft.
Claim 32
Dependent Claim 186 words
A four-wheel steering system comprising a front wheel turning mechanism for turning front wheels in response to operation of a steering wheel, a rear wheel turning mechanism for turning rear wheels in response to turning of the front wheels, and a relay shaft which transmits the amount of turning of the front wheels to the rear wheel turning mechanism, characterized in that the rear wheel turning mechanism comprises a rear wheel turning rod which extends in the transverse direction of the vehicle body and is movable in the direction of the vehicle body to turn the rear wheels respectively connected to the left and right ends thereof by way of wheel supports, a control means which controls the rear wheel turning rod according to the amount of turning of the front wheels transmitted thereto through an input shaft connected to the relay shaft by way of a connecting means, and a locking means which is adapted to prevent displacement of the input shaft, the locking means comprising a bolt which is adapted to be screwed into a bolt hole to be engaged with the input shaft.
Claim 33
Independent Claim 259 words
A method of incorporating in a vehicle a four-wheel steering system having a front wheel turning mechanism for turning front wheels in response to operation of a steering wheel, a rear wheel turning mechanism for turning rear wheels in response to turning of the front wheels according to preset four-wheel steering characteristics, and a relay shaft which transmits the amount of turning of the front wheels to the rear wheel turning mechanism, the rear wheel turning mechanism including a rear wheel turning rod which extends in the transverse direction of the vehicle body and is movable in the direction of the vehicle body to turn the rear wheels respectively connected to the left and right ends thereof by way of wheel supports, a control means which controls the rear wheel turning rod according to the amount of turning of the front wheels transmitted thereto through an input shaft connected to the relay shaft by way of a connecting means, and a locking means which is adapted to prevent displacement of the input shaft, comprising the steps of effecting adjustment of the front wheels and the rear wheels while the input shaft is disconnected from the relay shaft and locked by the locking means, subsequently connecting the input shaft with the relay shaft by way of the connecting means, releasing the lock of the input shaft by the locking means, driving the rear wheel turning rod by a hydraulic actuator of said control means, and controlling the hydraulic actuator according to the displacement of the input shaft using a controller.
Claim 34
Independent Claim 259 words
A method of incorporating in a vehicle a four-wheel steering system having a front wheel turning mechanism for turning front wheels in response to operation of a steering wheel, a rear wheel turning mechanism for turning rear wheels in response to turning of the front wheels according to preset four-wheel steering characteristics, and a relay shaft which transmits the amount of turning of the front wheels to the rear wheel turning mechanism, the rear wheel turning mechanism including a rear wheel turning rod which extends in the transverse direction of the vehicle body and is movable in the direction of the vehicle body to turn the rear wheels respectively connected to the left and right ends thereof by way of wheel supports, a control means which controls the rear wheel turning rod according to the amount of turning of the front wheels transmitted thereto through an input shaft connected to the relay shaft by way of a connecting means, and a locking means which is adapted to prevent displacement of the input shaft, comprising the steps of effecting adjustment of the front wheels and the rear wheels while the input shaft is disconnected from the relay shaft and locked by the locking means, subsequently connecting the input shaft with the relay shaft by way of the connecting means, releasing the lock of the input shaft by the locking means, driving the rear wheel turning rod by a hydraulic actuator of said control means, and controlling the hydraulic actuator according to the displacement of the input shaft using a controller.
Claim 35
Independent Claim 210 words
A method of incorporating in a vehicle a four-wheel steering system having a front wheel turning mechanism for turning front wheels in response to operation of a steering wheel, a rear wheel turning mechanism for turning rear wheels, a control means for controlling the rear wheel turning mechanism to turn the rear wheels according to preset four-wheel steering characteristics and a connecting means which is connected to the control means to transmit front wheel turning information to the control means, thereby operatively connecting the front wheel turning mechanism with the rear wheel turning mechanism, comprising the steps of causing the front wheel turning mechanism and the rear wheel turning mechanism to bring the front wheels and the rear wheels to respective reference positions and bringing the control means into a reference state while the connecting means is operatively disconnected from the control means, and connecting the connecting means to the control means, the reference position of the front wheels and the reference position of the rear wheels corresponding to each other on the basis of the preset four-wheel steering characteristics, the reference state of the control means being a state corresponding to the reference positions of the front and rear wheels on the basis of the preset four-wheel steering characteristics.
Claim 36
Independent Claim 210 words
A method of incorporating in a vehicle a four-wheel steering system having a front wheel turning mechanism for turning front wheels in response to operation of a steering wheel, a rear wheel turning mechanism for turning rear wheels, a control means for controlling the rear wheel turning mechanism to turn the rear wheels according to preset four-wheel steering characteristics and a connecting means which is connected to the control means to transmit front wheel turning information to the control means, thereby operatively connecting the front wheel turning mechanism with the rear wheel turning mechanism, comprising the steps of causing the front wheel turning mechanism and the rear wheel turning mechanism to bring the front wheels and the rear wheels to respective reference positions and bringing the control means into a reference state while the connecting means is operatively disconnected from the control means, and connecting the connecting means to the control means, the reference position of the front wheels and the reference position of the rear wheels corresponding to each other on the basis of the preset four-wheel steering characteristics, the reference state of the control means being a state corresponding to the reference positions of the front and rear wheels on the basis of the preset four-wheel steering characteristics.
Claim 37
Dependent Claim 30 words
A method as defined in claim 27 further comprising a step of adjusting toe-in of the front and rear wheels after the connecting means is connected to the control means.
Claim 38
Dependent Claim 44 words
A method as defined in claim 28 further comprising the steps of temporarily locking the control means to the reference state before connecting the connecting means to the control means, and releasing the control means after connecting the connecting means to the control means.
Claim 39
Dependent Claim 71 words
A method as defined in claim 27 further comprising a step adjusting toe-in of the front and rear wheels after the steps of causing the front wheel turning mechanism and the rear wheel turning mechanism to bring the front wheels and the rear wheels to the respective reference positions and bringing the control means into a reference state, and before the step of connecting the connecting means to the control means.
Claim 40
Dependent Claim 50 words
A method as defined in claim 30 further comprising the steps of temporarily locking the control means to the reference state before the step of adjusting toe-in of the front and rear wheels and releasing the control means after the step of connecting the connecting means to the control means.

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-08-07 1993-02-06 1993-08-08 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-08-07 1997-02-06 1997-08-08 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-08-07 2001-02-06 2001-08-08 $7700.00 Window Closed / Lapsed

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