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Inline check valve
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Patent number 6,427,711
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Issue date Aug 6, 2002
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Kemp Development Corporation
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Willard E. Kemp
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Flanged connection for flow line members
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Patent number 5,000,492
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Issue date Mar 19, 1991
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Kemp Development Corporation
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Willard E. Kemp
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Ball valve
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Patent number 4,940,208
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Issue date Jul 10, 1990
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Kemp Development Corporation
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Willard E. Kemp
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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flanged connection for valves
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Patent number 4,919,391
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Issue date Apr 24, 1990
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Kemp Development Corporation
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Willard E. Kemp
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Inline check valve
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Patent number 4,911,196
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Issue date Mar 27, 1990
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Kemp Development Corporation
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Willard E. Kemp
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Seat assembly for ball valves
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Patent number 4,911,408
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Issue date Mar 27, 1990
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Kemp Development Corporation
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Willard E. Kemp
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Ball valve
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Patent number 4,899,980
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Issue date Feb 13, 1990
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Kemp Development Corporation
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Willard E. Kemp
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...