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HENRY LETOREY
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HENRY LETOREY
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Publication of FR18460EpublicationCriticalpatent/FR18460E/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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FR18460D1912-01-151913-11-20Installation électrique pour appels lumineux
ExpiredFR18460E
(fr)