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Gate valve with spring assisted valve liner
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Patent number 5,582,200
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Issue date Dec 10, 1996
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Warman International, Ltd.
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Alvin A. Kimpel
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Spring-assisted split seat gate valve
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Patent number 5,413,140
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Issue date May 9, 1995
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Warman International Ltd.
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Alvin A. Kimpel
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Gate valve
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Patent number 5,271,426
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Issue date Dec 21, 1993
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The Clarkson Company
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Curtis W. Clarkson
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...