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 |