| 363 / | HD | ELECTRIC POWER CONVERSION SYSTEMS |
| 148 | DF | PHASE CONVERSION (Ph1-Ph2) WITHOUT INTERMEDIATE CONVERSION TO D.C. {5} |
| 152 | DF | .~ By induction-type converter {1} |
| 153 | DF | .~.~ Transformer type {1} |
| 154 | | .~.~.~ Stationary {1} |
| 155 | DF | .~.~.~.~> With passive phase shift element |