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Back-wash filter
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Patent number 7,250,109
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Issue date Jul 31, 2007
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Boll & Kirch Filterbau GmbH
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Rudiger Lennartz
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Tubular filter apparatus
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Patent number 4,517,086
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Issue date May 14, 1985
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Bergwerksverband
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Ingo Romey
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Flush-back filter
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Patent number 4,415,448
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Issue date Nov 15, 1983
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Boll & Kirch Filterbau GmbH
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Rudiger Lennartz
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Flush-back filter
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Patent number 4,256,583
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Issue date Mar 17, 1981
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Boll & Kirch Filterbau GmbH
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Rudiger Lennartz
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL