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Rangel & Guedes Soc
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Rangel & Guedes Soc
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Application filed by Rangel & Guedes SocfiledCriticalRangel & Guedes Soc
Application grantedgrantedCritical
Publication of FR677062ApublicationCriticalpatent/FR677062A/fr
G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
G08B5/00—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied
G08B5/22—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission
G08B5/36—Visible signalling systems, e.g. personal calling systems, remote indication of seats occupied using electric transmission; using electromagnetic transmission using visible light sources