| 123 / | HD | INTERNAL-COMBUSTION ENGINES |
| 319 | DF | ENGINE SPEED REGULATOR {16} |
| 349 | DF | .~ Having condition responsive means with engine being part of a closed feedback system (e.g., cruise control) {4} |
| 363 | DF | .~.~ Mechanical sensor or regulator {3} |
| 376 | ![]() | .~.~.~ Throttle positioning {1} |
| 377 | DF | .~.~.~.~> Safety override of dangerous manual position |