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WW1 British Army Tunneller's Bird Cage for Gas Detection in General / other
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Mydome Canary Gas Alarm | Accurate Natural Gas Detector With A Loud Alarm & Digital Display, Designed To Detect Combustible Gas Leaks Including LPG, Butane, Propane & Methane In The Home :
History in gas detection: Coal Mine Canaries & Flame Safety Lamps
Canaries As Poisonous Gas Detectors | Amusing Planet
