| 74 / | HD | MACHINE ELEMENT OR MECHANISM |
| 640 | DF | GEARING {31} |
| 434 | DF | .~ Rotary bodies {5} |
| 439 | | .~.~ Sectional {9} |
| 440 | DF | .~.~.~> Backlash take-up {1} |
| 443 | DF | .~.~.~> Sound deadening |
| 444 | DF | .~.~.~> Differential disks |
| 445 | DF | .~.~.~> Multiple disks |
| 446 | DF | .~.~.~> Separate rim {1} |
| 448 | DF | .~.~.~> Segmental rim |
| 449 | DF | .~.~.~> Sheet metal |
| 450 | DF | .~.~.~> Diametrically split |
| 451 | DF | .~.~.~> Shaft-admitting insert |