| 74 / | HD | MACHINE ELEMENT OR MECHANISM |
| 640 | DF | GEARING {31} |
| 325 | DF | .~ Interchangeably locked {11} |
| * | DD | .~.~ Slidable keys or clutches {3} |
| * | | .~.~.~ Multiple clutch shafts {4} |
| 357 | DF | .~.~.~.~> Progressive {1} |
| 359 | DF | .~.~.~.~> Selective |
| 360 | DF | .~.~.~.~> Multiple forward and reverse |
| 361 | DF | .~.~.~.~> Single forward and reverse |