| 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 | DF | .~.~.~ Responsive to speed or rotation phase angle {2} |
| 800 | DF | .~.~.~.~ With controlled power conversion {1} |
| 801 | ![]() | .~.~.~.~.~ Including inverter {1} |
| 802 | DF | .~.~.~.~.~.~> Responsive to an additional condition {1} |