| 310 / | HD | ELECTRICAL GENERATOR OR MOTOR STRUCTURE |
| 10 | DF | DYNAMOELECTRIC {5} |
| 15 | DF | .~ Reciprocating {7} |
| 17 | DF | .~.~ With other elements {2} |
| 20 | DF | .~.~.~ Motion-converting mechanism {2} |
| 21 | DF | .~.~.~.~ Pivoted or flat-spring armature {1} |
| 22 | ![]() | .~.~.~.~.~ Plural armatures |