FR690398A - Perfectionnements apportés aux dispositifs de signalisation utilisant des oscillations électromagnétiques à haute fréquence
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Perfectionnements apportés aux dispositifs de signalisation utilisant des oscillations électromagnétiques à haute fréquence
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THEREMIN PATENTS CORP
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THEREMIN PATENTS CORP
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G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
G08B13/00—Burglar, theft or intruder alarms
G08B13/22—Electrical actuation
G08B13/26—Electrical actuation by proximity of an intruder causing variation in capacitance or inductance of a circuit
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FR690398D1930-02-211930-02-21Perfectionnements apportés aux dispositifs de signalisation utilisant des oscillations électromagnétiques à haute fréquence
ExpiredFR690398A
(fr)