| 310 / | HD | ELECTRICAL GENERATOR OR MOTOR STRUCTURE |
| 10 | DF | DYNAMOELECTRIC {5} |
| 40 R | DF | .~ Rotary {28} |
| 127 | DF | .~.~ Plural collector-type machines {4} |
| 128 | | .~.~.~ Commutator and slip-ring type {4} |
| 129 | DF | .~.~.~.~> Synchronous or rotary converter {1} |
| 131 | DF | .~.~.~.~> Different armature circuits {1} |
| 133 | DF | .~.~.~.~> Common armature winding {1} |
| 135 | DF | .~.~.~.~> Commutator in field circuit |