| 318 / | HD | ELECTRICITY: MOTIVE POWER SYSTEMS |
| 727 | DF | INDUCTION MOTOR SYSTEMS {12} |
| 830 | ![]() | .~ With relatively movable cooperating motor parts to control energized motor {2} |
| 831 | DF | .~.~> Axially movable cooperating parts |
| 832 | DF | .~.~> Dual stators, one or both angularly movable |