| 74 / | HD | MACHINE ELEMENT OR MECHANISM |
| 640 | DF | GEARING {31} |
| 325 | DF | .~ Interchangeably locked {11} |
| * | DD | .~.~ Longitudinally slidable {5} |
| * | | .~.~.~ Multiple spur gears {4} |
| 341 | DF | .~.~.~.~> With tumbler gear |
| 342 | DF | .~.~.~.~> Selective {1} |
| 344 | DF | .~.~.~.~> Progressive {1} |
| 346 | DF | .~.~.~.~> Fluid operated |