| 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} |
| 350 | DF | .~.~ Electrical sensing or regulating {3} |
| 362 | ![]() | .~.~.~ Cold engine control |