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Secondary backseat for gate valve
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Patent number 4,682,757
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Issue date Jul 28, 1987
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Joy Manufacturing Company
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William S. Shelton
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Heat responsive backseat for gate valves
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Patent number 4,658,848
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Issue date Apr 21, 1987
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Joy Manufacturing Company
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Danny S. Meyer
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Ball valve with seat loading mechanism
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Patent number 4,601,308
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Issue date Jul 22, 1986
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Joy Manufacturing Company
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Ralph S. Stone
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Lubricant fitting for a valve
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Patent number 4,354,523
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Issue date Oct 19, 1982
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ACF Industries, Incorporated
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William R. Hochmuth
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Valve seat structure
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Patent number 4,320,890
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Issue date Mar 23, 1982
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ACF Industries, Incorporated
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Danny S. Meyer
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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