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Stacker
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Patent number 5,433,292
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Issue date Jul 18, 1995
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HK Systems, Inc.
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Ralph B. Haymore
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B66 - HOISTING LIFTING HAULING
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Ragless propeller draft tube mixer
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Patent number 4,647,215
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Issue date Mar 3, 1987
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Envirotech Corporation
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Jack R. Armitage
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Apparatus for granular media filter
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Patent number 4,624,783
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Issue date Nov 25, 1986
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Envirotech Corporation
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Brent C. Black
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Ragless propeller draft tube mixer
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Patent number 4,575,256
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Issue date Mar 11, 1986
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Envirotech Corporation
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Jack R. Armitage
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Granular media filter
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Patent number 4,450,077
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Issue date May 22, 1984
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Envirotech Corporation
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Brent C. Black
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL