| 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} |