| 318 / | HD | ELECTRICITY: MOTIVE POWER SYSTEMS |
| 280 | DF | MOTOR-REVERSING {4} |
| 296 | DF | .~ Field circuit control {2} |
| 297 | DF | .~.~ Plural, diverse or diversely controlled field windings {1} |
| 298 | DF | .~.~.~ Simultaneous energization {1} |
| 299 | ![]() | .~.~.~.~ With means for short-circuiting a winding |