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G04C3/00—Electromechanical clocks or watches independent of other time-pieces and in which the movement is maintained by electric means
G04C3/04—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 balance
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FR44907D1934-06-121934-06-12Perfectionnements aux systèmes de contact électrique pour l'entretien des balanciers circulaires
ExpiredFR44907E
(fr)