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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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FR36841D1929-04-261929-04-26Pendules, horloges ou réveils électriques à pendule ou à balancier
ExpiredFR36841E
(fr)