| 318 / | HD | ELECTRICITY: MOTIVE POWER SYSTEMS |
| 727 | DF | INDUCTION MOTOR SYSTEMS {12} |
| 767 | DF | .~ Primary circuit control {9} |
| 798 | DF | .~.~ Responsive to motor condition {2} |
| 799 | ![]() | .~.~.~ Responsive to speed or rotation phase angle {2} |
| 800 | DF | .~.~.~.~> With controlled power conversion {1} |
| 804 | DF | .~.~.~.~> With controlled magnetic reactance |