| 123 / | HD | INTERNAL-COMBUSTION ENGINES |
| 434 | DF | CHARGE FORMING DEVICE (E.G., POLLUTION CONTROL) {29} |
| 579 | DF | .~ Multiple carburetors {4} |
| 583 | ![]() | .~.~ With linkage between carburetor throttle valves {1} |
| 584 | DF | .~.~.~> Staged opening of carburetor throttle valves |