| 91 / | HD | MOTORS: EXPANSIBLE CHAMBER TYPE |
| 218 | DF | CYCLICALLY OPERABLE {34} |
| 247 | DF | .~ Timing control by relative adjustment of plural movable fluid control elements {3} |
| 249 | DF | .~.~ With relative adjustment of plural adjustable fluid control elements {1} |
| 250 | ![]() | .~.~.~ Adjustable inlet and exhaust events {1} |
| 251 | DF | .~.~.~.~> With adjustable release and compression events |