THIS APPLICATION DESCRIBES AN ENDLESS POSITIVE-DRIVE TOOTHED BELT WHICH IS CHARACTRIZED IN THAT IT IS COMPOSED OF A FLEXIBLE PLASTICS MATERIAL AND HAS ON AT LEAST ONE FACE A SERIES OF RACK TEETH, THE BELT BEING OF SUCH A DEGREE OF RIGIDITY THAT, WHEN USED FOR TRANSMITTING DRIVE AS A MOVING RACK FROM A DRIVING PINION MEMBER TO A DRIVES PINION MEMBER, THE LENGTH OF THE BELT BETWEEN DRIVING AND DRIVEN PINION MEMBERS CO-OPERATING THEREWITH MAINTAINS A PATH DICATED BY THE PHYSICAL CHARACTERISTICS OF THE BELT AND THE LOCATION OF THE SAID MEMBERS, WHICH PATH IS SUBSTANTIALLY UNAFFECTED BY GRAVITATIONAL FORCES ON THE BELT.