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Denitrification system
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Patent number 5,556,538
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Issue date Sep 17, 1996
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Gary J. Beard
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Turbulence control system
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Patent number 4,780,206
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Issue date Oct 25, 1988
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Harold J. Beard
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE