Endless full track tractor and control devices

Claim 1

IN A TRACTOR HAVING A FRAME PROVIDED WITH RIGHT AND LEFT REARWARD DRIVING WHEELS, EACH FORMED WITH A TREAD PORTION, A SOURCE OF POWER, A DIFFERENTIAL MECHANISM CONNECTING SAID SOURCE OF POWER WITH SAID DRIVING WHEELS AND INDIVIDUAL BRAKES FOR EACH OF SAID DRIVING WHEELS AND COMBINATION OF A FORWARD SUPPORTING STRUCTURE FIXEDLY MOUNTED ON SAID FRAME, ROCKING BEAMS HINGEDLY MOUNTED ON SAID SUPPORTING STRUCTURE FOR INDEPENDENT ROCKING MOVEMENT ON ALIGNED TRANSVERSE HORIZONTAL AXES, ONE SUCH BEAM ON EACH SIDE OF SAID TRACTOR, FORWARD RIGHT AND LEFT SUPPORTING WHEELS MOUNTED FORWARDLY ON EACH SIDE OF SAID SUPPORTING STRUCTURE, SAID SUPPORTING WHEELS ON EACH SIDE HAVING TREAD PORTIONS ALIGNED WITH THE TREAD PORTION OF THE CORRESPONDING DRIVING WHEEL UNDER ALL OPERA ING CONDITIONS, OPERATING MEANS ON SAID TRACTOR FOR APPLYING EITHER OR BOTH OF SAID BRAKES, A SEPARATE MANUAL STEERING DEVICE MOUNTED ON SAID TRACTOR ADJACENT SAID BRAKE OPERATING MEANS AND MOVABLE SELECTIVELY IN OPPOSITE DIRECTIONS, MEANS FOR APPLYING ONE OF SAID BRAKES WHEN SAID MANUAL STEERING DEVICE IS MOVED IN ONE DIRECTION AND FOR APPLYING THE OTHER OF SAID BRAKES WHEN SAID STEERING DEVICE IS MOVED IN THE OTHER DIRECTION AND FLEXIBLE ENDLESS TRACKS EACH MOUNTED OVER THE REARWARD DRIVING WHEELS AND FORMED SUPPORTING WHEELS ON EACH SIDE THEREOF ON WHICH SAID TRACTOR TRAVELS.