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PCE
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CPC Subgroup
G08B 17/117

by using a detection device for specific gases, e.g. combustion products, produced by the fire (G08B17/103, G08B17/11 take precedence)

Full Title

Fire alarms; Alarms responsive to explosion > Actuation by presence of smoke or gases > by using a detection device for specific gases, e.g. combustion products, produced by the fire (G08B17/103, G08B17/11 take precedence)