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G04C13/00—Driving mechanisms for clocks by primary clocks
G04C13/02—Circuit arrangements; Electric clock installations
G04C13/04—Primary clocks
G04C13/0463—Arrangements for generating normal driving pulses
G04C13/0481—Arrangements for generating normal driving pulses by switching on an electromagnetic driving device, e.g. electro-motor, controlling the contacts
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General Physics & Mathematics
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FR25488D1921-10-061921-10-06Dispositif électrique de distribution collective de l'heure
ExpiredFR25488E
(fr)