Patent classifications
G
PHYSICS
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G04
HOROLOGY
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G04C
ELECTROMECHANICAL CLOCKS OR WATCHES
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13/00
Driving mechanisms for clocks by primary clocks
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G04C13/08
Secondary clocks actuated intermittently
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G04C13/10
by electromechanical step-advancing mechanisms
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G04C13/11
with rotating armature
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