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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G08B13/2402
Electronic Article Surveillance [EAS], i.e. systems using tags for detecting removal of a tagged item from a secure area, e.g. tags for detecting shoplifting
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G08B13/2451
Specific applications combined with EAS
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