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Licentia Patent Verwaltungs GmbH
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Licentia Patent Verwaltungs GmbH
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Publication of FR870927ApublicationCriticalpatent/FR870927A/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
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Physics & Mathematics
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Electromagnetism
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General Physics & Mathematics
(AREA)
FR870927D1940-03-201941-03-17Dispositif de montage pour la transmission d'ordres à distance
ExpiredFR870927A
(fr)