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G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
G08B5/00—Visible signalling systems, e.g. visible personal calling systems or remote indication of seats occupied
G08B5/22—Visible signalling systems, e.g. visible personal calling systems or remote indication of seats occupied using electric transmission; using electromagnetic transmission
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FR43563D1933-03-221933-03-22Perfectionnements aux transmissions à distance par potentiomètre
ExpiredFR43563E
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