Surface with object detector - is used in security system and has object located in capacitive field changing if object is removed
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Load monitoring circuit for security alarm system - ensures that release of load causes cable to complete electrical alarm circuit
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ELECTRICAL ALARM SYSTEM
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Body vibration detector for alarms - has inbuilt suppressor for environmental disturbance effects and permits abnormal sounds to pass through
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Transistor overload protection system - has inversely operated diode which controls transistor input voltage, and is thermally connected to it
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Fixing for body vibration pick=up - has tapered plug attached to pick=up that locates in base fixing
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Emergency actuator for electric alarm cut=out - has facility to provide interruption on malfunction permitting system to operate and uses spring in contact block to manipulate contacts
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Supervisory scanning system for telephone networks - sends interrogation signals between stations and provides four operating condition indicators
DE1232857B
Electrical device against theft of movable objects, especially paintings
DE715311C
Circuit arrangement to ensure agreement between the command transmitter and command receiver position
