Grade control system on bituminous pavers

Claim 1

IN COMBINATION WITH A PAVING MACHINE THAT IS MOVING FORWARDLY OVER THE GROUND AND THAT COMPRISES TWO DRAFT ARMS PIVOTALLY MOUNTED AT OPPOSITE SIDES OF THE MACHINE ON TRANSVERSE PIVOT AXES AND EXTENDING REARWARDLY THEREFROM, A SCREED AND TAMPER UNIT WITH THE SCREED HAVING PORTIONS MOUNTED ON THE RESPECTIVE DRAFT ARMS ADJACENT THEIR REARWARD ENDS, MEANS FOR DEPOSITING PAVING MATERIAL ADJACENT A FORWARD EDGE OF SAID SCREED TO FORM A MAT SURFACE ON WHICH THE SCREED RIDES, A TRANSVERSE BEAM SUPPORTED ON SAID DRAFT ARMS ADJACENT SAID UNIT, A TRANSVERSE SLOPE ANGLE SENSING MEANS SUPPORTED ON SAID TRANSVERSE BEAM IMMEDIATELY ADJACENT AND FORWARDLY OF SAID SCREED AND TAMPERED UNIT FOR EMITTING AN ELECTRICAL SIGNAL TO A CONTROL MEANS, GRADE SENSING MEANS SUPPORTED ON SAID TRANSVERSE BEAM IMMEDIATELY ADJACENT AND FORWARDLY OF SAID SCREED AND TAMPER UNIT AT ONE SIDE OF SAID MACHINE FOR EMITTING AN ELECTRICAL SIGNALS TO A CONTROL MEANS, CONTROL MEANS FOR RECEIVING ELECTRICAL SIGNALS FROM SAID SLOPE ANGLE SENSING MEANS AND FROM SAID GRADE SENSING MEANS FOR EMITTING AMPLIFIED ELECTRICASL SIGNALS, A PAIR OF CYLINDERS HAVING LEVELING RAMS CONNECTED WITH AND SUPPORTING SAID DRAFT ARMS ON SAID MACHINE ADJACENT SAID TRANSVERSE PIVOT AXES FOR RAISING AND LOWERING THE PIVOT AXES OF SAID ARMS, AND ELECTRICALLY OPERATED VALVES EACH OPERATIVELY ASSOCIATED WITH ONE OF SAID LEVELING RAMS AND BEING OPERATIVELY ASSOCIATED WITH SAID CONTROL MEANS FOR RECEIVING AMPLIFIED ELECTRICAL SIGNALS THEREFROM FOR CAUSING INDEPENDENT CONTROLLED MOVEMENT OF SAID RAMS TO MOVE SAID TRANSVERSE PIVOT AXES AND SAID SCREED TO CORRECT DEVIATIONS FROM A GRADE LINE AND/OR TO CORRECT DEVIATIONS IN THE TRANSVERSE SLOPE ANGLE TO FORM A MAT SURFACE HAVING A DESIRED TRANSVERSE SLOPE.