| 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} | 
| 364 | DF | .~.~.~ Fuel injection pump governor (e.g., diesel) {6} | 
| 365 |  | .~.~.~.~ Governor override {2} | 
| 366 | DF | .~.~.~.~.~> Engine starting or warm-up control | 
| 367 | DF | .~.~.~.~.~> Variable throttle or control rod stop |