| 323 / | HD | ELECTRICITY: POWER SUPPLY OR REGULATION SYSTEMS |
| 318 | DF | EXTERNAL OR OPERATOR CONTROLLED {5} |
| 328 | DF | .~ Using a transformer or inductor as the final control device {6} |
| 347 | DF | .~.~ Having movable structure or winding {1} |
| 348 | | .~.~.~ Including rotary motion |