| 74 / | HD | MACHINE ELEMENT OR MECHANISM |
| 640 | DF | GEARING {31} |
| 325 | DF | .~ Interchangeably locked {11} |
| * | | .~.~ Longitudinally slidable {5} |
| * | DD | .~.~.~> Multiple spur gears {4} |
| 347 | DF | .~.~.~> Multiple bevel gears |
| * | DD | .~.~.~> Single spur gear {1} |
| 350 | DF | .~.~.~> Single bevel gear |
| 351 | DF | .~.~.~> Pin or crown gears |