| 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} |
| 329 | DF | .~.~ Controllably saturable {5} |
| 332 | DF | .~.~.~ With plural power windings {3} |
| 333 | ![]() | .~.~.~.~ In bridge configuration or in bridge arm |