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G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
G08B3/00—Audible signalling systems, e.g. audible personal calling systems
G08B3/10—Audible signalling systems, e.g. audible personal calling systems using electric transmission; using electromagnetic transmission
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FR831006D1937-03-311937-03-31Dispositif avertisseur radio-électrique, notamment applicable à la circulation automobile ou analogue
ExpiredFR831006A
(fr)