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CH667892A5
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Pedestal height marker for walls of rooms - has scriber or pen adjustably mounted in housing vertically adjustable on rod supported by base plate
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EP0039371A2
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Surveillance device for the field behind a security fence
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DE3010522A1
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Security fence back-up alarm mesh - has connection to Y=shaped arm and movement indicator initiating alarm when moved vertically
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DE3006999A1
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Circuit for security fence - has four wires forming arms of Wheatstone bridge to release alarm when short-circuited
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DE2834957A1
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Wheatstone bridge for alarm systems - has basic arrangement with additional resistors to eliminate spurious switching
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CH624447A5
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Surrounding fence with an alarm device for security-threatened installations
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DE2746068A1
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High security interwoven wire fence - has plastic sheath enclosing steel reinforcing wire and resistance wire connected in bridge circuit
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DE2717906A1
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Security alarm for fence - has switch tripped by movement of spring supported Y=shaped top rail
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DE2656349A1
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High security interwoven wire fence - has plastic sheath enclosing steel reinforcing wire and resistance wire connected in bridge circuit
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