| 74 / | HD | MACHINE ELEMENT OR MECHANISM |
| 469 | DF | CONTROL LEVER AND LINKAGE SYSTEMS {8} |
| * | DD | .~ Elements {8} |
| 543 | DF | .~.~ Handles {6} |
| 551.1 | ![]() | .~.~.~ Handle bars {4} |
| 551.2 | DF | .~.~.~.~> Spring biased or supported |
| 551.3 | DF | .~.~.~.~> Folding or adjustable {2} |
| 551.8 | DF | .~.~.~.~> Attachments and accessories |
| 551.9 | DF | .~.~.~.~> Handholds and grips |