Patent classifications
G
PHYSICS
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G04
HOROLOGY
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G04C
ELECTROMECHANICAL CLOCKS OR WATCHES
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3/00
Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
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G04C3/04
wherein movement is regulated by a balance
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G04C3/06
using electromagnetic coupling between electric power source and balance
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