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G04C21/00—Producing acoustic time signals by electrical means
G04C21/16—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times
G04C21/20—Producing acoustic time signals by electrical means producing the signals at adjustable fixed times by closing a contact to ring an electromechanical alarm
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FR579414D1922-12-181923-12-14Perfectionnements aux horloges électriques
ExpiredFR579414A
(fr)