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Screenless granular bed filter
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Patent number 4,155,728
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Issue date May 22, 1979
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The Ducon Company, Inc.
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Frederick A. Zenz
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Screenless granular bed filter
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Patent number 4,140,497
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Issue date Feb 20, 1979
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The Ducon Company, Inc.
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Frederick A. Zenz
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Granular bed filter
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Patent number 4,067,704
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Issue date Jan 10, 1978
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The Ducon Company, Inc.
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Frederick A. Zenz
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL