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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G08B13/16
Actuation by interference with mechanical vibrations in air or other fluid
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G08B13/1654
using passive vibration detection systems
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