GB2061642A
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Back-up power supply
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CA1139859A
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Alarm system
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Four wire multi-satellite intrusion alarm with multiplex annunciation
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CA1106464A
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Four wire multi-satellite intrusion alarm with multiplex annunciation
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DE2808502A1
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Multi-satellite intrusion alarm control system - has master unit connected to satellite by only four conductors to enable analysis of cause of alarm
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GB1596606A
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Four wire multi-satellite intrusion alarm control system with tamper switch
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Four wire multi-satellite intrusion alarm control system with tamper switch
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CA1084604A
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Four wire multi-satellite intrusion alarm control system with tamper switch
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US4101875A
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Multi-satellite intrusion alarm control system
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Filter system and method for intrusion alarm
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CA1087715A
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Multi-satellite intrusion alarm control system
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CA1102436A
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Filter system and method for intrusion alarm
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US3980998A
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Intrusion alarms
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CA1014647A
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Intrusion alarms
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