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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15/00
Identifying, scaring or incapacitating burglars, thieves or intruders, e.g. by explosives
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G08B15/001
Concealed systems, e.g. disguised alarm systems to make covert systems
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