US PATENT SUBCLASS 290 / 8
.~ Excitation dynamo

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290 /   HD   PRIME-MOVER DYNAMO PLANTS

7  DF  ELECTRIC CONTROL {10}
8.~ Excitation dynamo

DEFINITION

Classification: 290/8

Prime-mover dynamo plants comprising a dynamo in a field-excitation circuit of which is another dynamo for furnishing or controlling current in the field-excitation circuit.