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Wastewater treatment unit
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Patent number 8,920,642
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Issue date Dec 30, 2014
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Glenn Helm
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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3202286
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Patent number 3,202,286
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Issue date Aug 24, 1965
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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1150367
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Patent number 1,150,367
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Issue date Aug 17, 1915
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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1090283
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Patent number 1,090,283
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Issue date Mar 17, 1914
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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627157
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Patent number 627,157
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Issue date Jun 20, 1899
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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484781
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Patent number 484,781
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Issue date Oct 25, 1892
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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476737
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Patent number 476,737
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Issue date Jun 7, 1892
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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442539
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Patent number 442,539
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Issue date Dec 9, 1890
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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360850
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Patent number 360,850
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Issue date Apr 12, 1887
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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283103
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Patent number 283,103
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Issue date Aug 14, 1883
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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165377
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Patent number 165,377
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Issue date Jul 6, 1875
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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159364
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Patent number 159,364
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Issue date Feb 2, 1875
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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130316
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Patent number 130,316
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Issue date Aug 6, 1872
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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58868
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Patent number 58,868
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Issue date Oct 16, 1866
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE