| 123 / | HD | INTERNAL-COMBUSTION ENGINES |
| 434 | DF | CHARGE FORMING DEVICE (E.G., POLLUTION CONTROL) {29} |
| 445 | DF | .~ Fuel injection system {5} |
| 446 | DF | .~.~ Fuel pump flow regulation {4} |
| 448 | ![]() | .~.~.~ Sequential distributor {3} |
| 449 | DF | .~.~.~.~> Rotary and reciprocating distributor |
| 450 | DF | .~.~.~.~> Rotary distributor |
| 451 | DF | .~.~.~.~> Reciprocating distributor |