CH567297ACH378770ACH378770ACH567297ACH 567297 ACH567297 ACH 567297ACH 378770 ACH378770 ACH 378770ACH 378770 ACH378770 ACH 378770ACH 567297 ACH567297 ACH 567297A
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CH
Switzerland
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CH378770A
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Publication of CH567297ApublicationCriticalpatent/CH567297A/xx
G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
G04C3/08—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically
G04C3/12—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means wherein movement is regulated by a mechanical oscillator other than a pendulum or balance, e.g. by a tuning fork, e.g. electrostatically driven by piezoelectric means; driven by magneto-strictive means