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Publication of FR750184ApublicationCriticalpatent/FR750184A/fr
G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
G08B13/00—Burglar, theft or intruder alarms
G08B13/18—Actuation by interference with heat, light, or radiation of shorter wavelength; Actuation by intruding sources of heat, light, or radiation of shorter wavelength
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FR750184D1932-02-041933-02-04Perfectionnements apportés et relatifs aux systèmes ou dispositifs photogélectriques
ExpiredFR750184A
(fr)