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 |