| 74 / | HD | MACHINE ELEMENT OR MECHANISM |
| * | DD | MECHANICAL MOVEMENTS {15} |
| 89 | DF | .~ Reciprocating or oscillating to or from alternating rotary {6} |
| 89.2 | | .~.~ Including flexible drive connector (e.g., belt, chain, strand, etc.) {2} |
| 89.21 | DF | .~.~.~> With sprocket wheel |
| 89.22 | DF | .~.~.~> With pulley |