| 318 / | HD | ELECTRICITY: MOTIVE POWER SYSTEMS |
| 119 | DF | RECIPROCATING OR OSCILLATING MOTOR {4} |
| 122 | ![]() | .~ Plural, diverse or diversely controlled motor windings {2} |
| 123 | DF | .~.~> Polyphase or diverse or diversely controlled sources of motor supply {1} |
| 125 | DF | .~.~> Unidirectionally conductive devices in energizing circuit |