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Flocculant control system
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Patent number 5,006,231
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Issue date Apr 9, 1991
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Consolidation Coal Company
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Hayward B. Oblad
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Flocculant control system
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Patent number 4,950,908
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Issue date Aug 21, 1990
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Consolidation Coal Company
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Hayward B. Oblad
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE