Q:I own a heavy 1-gallon copper-clad and brass fire extinguisher. There’s a pressure gauge, T-shape handle and short hose at the top of the cylindrical container. It’s marked “Phister No. 1 carbon tetrachloride fire extinguisher.” Patent numbers on its metal label range from 1,467,980 to 1,794,982. It was made in Cincinnati. When was it made and what’s the best way to sell it?    

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