| 123 / | HD | INTERNAL-COMBUSTION ENGINES |
| 434 | DF | CHARGE FORMING DEVICE (E.G., POLLUTION CONTROL) {29} |
| 672 | DF | .~ Including exhaust gas condition responsive means {11} |
| 674 | ![]() | .~.~ With modifying or updating memory (i.e., learning) {1} |
| 675 | DF | .~.~.~> Acceleration or deceleration responsive |