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 |