m40 gas detector WV ,KY,PA coal mining methane,oxygen, CO,CH4,h2s,O2 charger $50.00 USD Sold on: 2012-Dec-17 Marketplace: eBay 1 Treasure 0 Trash 100% Detail: Hello , I have a United Central M40 M gas detector used in a West Virginia underground coal mine i bought it 2 years ago but out of 2 years its been used for about a year, the plastic screen cover is ... More Relevance Historical Items
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