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Method of making a filter element
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Patent number 5,893,956
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Issue date Apr 13, 1999
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Perry Equipment Corporation
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Marney Dunman Perry
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Scum skimmer apparatus
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Patent number 4,046,693
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Issue date Sep 6, 1977
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Harsco Corporation
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Nolan S. Glover
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C02 - TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Sludge scraper mechanism
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Patent number 4,046,700
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Issue date Sep 6, 1977
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Harsco Corporation
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Nolan S. Glover
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL