Patent classifications
G
PHYSICS
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G08
SIGNALLING
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G08B
SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
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13/00
Burglar, theft or intruder alarms
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G08B13/24
by interference with electromagnetic field distribution
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G08B13/2491
Intrusion detection systems, i.e. where the body of an intruder causes the interference with the electromagnetic field
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