| 310 / | HD | ELECTRICAL GENERATOR OR MOTOR STRUCTURE |
| 10 | DF | DYNAMOELECTRIC {5} |
| 40 R | DF | .~ Rotary {28} |
| 179 | DF | .~.~ Windings and core structure {7} |
| 180 | DF | .~.~.~ Field or excitation windings or structure {9} |
| 184 | DF | .~.~.~.~ Plural field windings {4} |
| 188 | | .~.~.~.~.~ Differentially related |