Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Compagnie des Telephones Thomson Houston
Original Assignee
Compagnie des Telephones Thomson Houston
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Filing date
Publication date
Application filed by Compagnie des Telephones Thomson HoustonfiledCriticalCompagnie des Telephones Thomson Houston
Application grantedgrantedCritical
Publication of FR859313ApublicationCriticalpatent/FR859313A/fr
G08B—SIGNALLING OR 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
Landscapes
Physics & Mathematics
(AREA)
General Physics & Mathematics
(AREA)
FR859313D1939-05-081939-05-08Perfectionnements aux dispositifs de signalisation ou de protection contre le vol oudispositifs similaires
ExpiredFR859313A
(fr)