318 / | HD | ELECTRICITY: MOTIVE POWER SYSTEMS |
34 | DF | PLURAL, DIVERSE OR DIVERSELY CONTROLLED ELECTRIC MOTORS {22} |
53 | DF | .~ Plural, diverse motor controls {4} |
54 | DF | .~.~ Motor-reversing {3} |
55 | DF | .~.~.~ With running-speed control {1} |
56 | .~.~.~.~ And braking |