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} |
334 | .~.~.~.~ On different legs of single core |