303 / | HD | FLUID-PRESSURE AND ANALOGOUS BRAKE SYSTEMS |
121 | DF | SPEED-CONTROLLED {44} |
122 | DF | .~ With failure responsive means {8} |
122.04 | DF | .~.~ Electric system failure (no warning) {1} |
122.05 | .~.~.~ Electronic or electric component (e.g., speed detector, failure sensing) with warning |