| 123 / | HD | INTERNAL-COMBUSTION ENGINES |
| 319 | DF | ENGINE SPEED REGULATOR {16} |
| 349 | ![]() | .~ 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} |
| 363 | DF | .~.~> Mechanical sensor or regulator {3} |
| 378 | DF | .~.~> Fluidic sensor or regulator {6} |
| 394 | DF | .~.~> By combustion air or air-fuel mixture cutoff |