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US5019802A
(en)
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Intrusion detection apparatus
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US5428345A
(en)
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Method of and apparatus for operating a security system to produce an alarm signal
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ATE109912T1
(de)
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Verfahren für eindringalarm und system dafür.
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KR840005244A
(ko)
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보안 경보 시스템
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ES472658A1
(es)
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Instalacion de alarma para el aseguramiento de un paso, es- pecialmente de una ventana o de una puerta en una casa.
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US4209777A
(en)
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Non-compromisable intrusion sensor circuit
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GB1458977A
(en)
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System and method for detecting unauthorized removal of goods from protected premises and magnet detecting apparatus suitable for use therein
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US4803482A
(en)
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Exit control and surveillance system
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GB1475758A
(en)
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Intruder or vehicle theft alarm system
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US4549168A
(en)
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Remote station monitoring system
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US3588865A
(en)
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Security alarm system
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US4150369A
(en)
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Intrusion alarm system
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PL97649B2
(no)
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US3686668A
(en)
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Fire and burglar alarm system
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WO1990007170A1
(en)
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Security and alarm system
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GB1595788A
(en)
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Warning systems
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US4065762A
(en)
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A.C. bridge intrusion alarm system
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GB1429781A
(en)
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Multi-point alarm systems
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US6255936B1
(en)
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Beeper security system
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FR2438253A2
(fr)
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Detecteur magnetique du deplacement relatif de deux objets, notamment detecteur d'ouverture pour systemes de protection
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GB1416346A
(en)
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Security fences and systems embodying them
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US4178587A
(en)
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Security lock system
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RU2035768C1
(ru)
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Устройство для охранной сигнализации
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RU2081454C1
(ru)
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Устройство для охранной сигнализации
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SU762019A1
(ru)
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Устройство для тревожной сигнализации 1
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