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SOC IND DES TELEPHONES CONSTR
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SOC IND DES TELEPHONES CONSTR
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Application grantedgrantedCritical
Publication of FR427330ApublicationCriticalpatent/FR427330A/en
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
(AREA)
Electromagnetism
(AREA)
General Physics & Mathematics
(AREA)
FR427330D1911-03-041911-03-04
Device for remote control
ExpiredFR427330A
(en)