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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G04C3/08
wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork; , e.g. electrostatically
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G04C3/12
driven by piezoelectric means; driven by magneto-strictive means
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