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Gas absorber
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Patent number 4,317,731
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Issue date Mar 2, 1982
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FMC Corporation
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Thomas E. Roberts
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Pressurized oxygenation of sewage
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Patent number 4,171,263
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Issue date Oct 16, 1979
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FMC Corporation
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Thomas E. Roberts
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE