| 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 | ![]() | .~.~.~ With plural power windings {3} |
| 333 | DF | .~.~.~.~> In bridge configuration or in bridge arm |
| 334 | DF | .~.~.~.~> On different legs of single core |
| 335 | DF | .~.~.~.~> On different cores {2} |