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#coal mine #miner's canary #warning sign #gas detection #safety indicator #idiom

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#canary #coal mine #mine safety #historical mining #gas detection #miner

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#gas detection #gas detector #chemical sensor #hazardous gas #industrial safety #toxic gas monitoring #dräger safety

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#canary in coal mine #air quality mining #gas detection #mine ventilation #historical safety #safe air #methane detection