474 / | HD | ENDLESS BELT POWER TRANSMISSION SYSTEMS OR COMPONENTS |
101 | DF | MEANS FOR ADJUSTING BELT TENSION OR FOR SHIFTING BELT, PULLEY OR GUIDE ROLL {11} |
133 | DF | .~ Guide roll mounted for movement of its axis along arcuate path to tension belt {2} |
134 | .~.~ Plural guide rolls engaging single belt |