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Publication of FR763545ApublicationCriticalpatent/FR763545A/fr
G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
G08B3/00—Audible signalling systems; Audible personal calling systems
G08B3/10—Audible signalling systems; Audible personal calling systems using electric transmission; using electromagnetic transmission
FR763545D1932-11-181933-11-07Dispositif pour l'alimentation d'un générateur sonore à courant alternatif par unréseau à courant continu
ExpiredFR763545A
(fr)