| 123 / | HD | INTERNAL-COMBUSTION ENGINES |
| 434 | DF | CHARGE FORMING DEVICE (E.G., POLLUTION CONTROL) {29} |
| 518 | DF | .~ Having fuel vapor recovery and storage system {1} |
| 519 | ![]() | .~.~ Having an adsorbent canister {1} |
| 520 | DF | .~.~.~> Purge valve controlled by engine parameter {1} |