474 / | HD | ENDLESS BELT POWER TRANSMISSION SYSTEMS OR COMPONENTS |
64 | PLURAL TURNS OF SAME BELT ABOUT PULLEY AXIS {2} | |
65 | DF | .~> With flexible belt-tracking guide helically coiled about pulley |
66 | DF | .~> Plural turns of same belt about axis of each of laterally spaced pulleys {1} |