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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21/00
Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
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G08B21/02
Alarms for ensuring the safety of persons
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G08B21/12
responsive to undesired emission of substances, e.g. pollution alarms
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G08B21/14
Toxic gas alarms
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