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Pressure vessel clamp connector
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Patent number 6,003,548
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Issue date Dec 21, 1999
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Hydril Company
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John Daniel Muchow
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Drilling choke valve
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Patent number 4,531,545
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Issue date Jul 30, 1985
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Hydril Company
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John D. Muchow
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E21 - EARTH DRILLING MINING
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Valve apparatus
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Patent number 4,471,810
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Issue date Sep 18, 1984
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Valve Concepts International
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John D. Muchow
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Drilling choke
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Patent number 4,461,316
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Issue date Jul 24, 1984
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Hydril Company
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Harry R. Cove
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E21 - EARTH DRILLING MINING
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Multiple orifice valves
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Patent number 4,360,040
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Issue date Nov 23, 1982
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Smith International Inc.
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Harry R. Cove
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Pig ball transfer unit
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Patent number 4,199,834
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Issue date Apr 29, 1980
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Willis Oil Tool Co.
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John D. Muchow
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F17 - STORING OF DISTRIBUTING GASES OR LIQUIDS
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Automatic reset pilot valve
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Patent number 4,116,215
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Issue date Sep 26, 1978
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Willis Oil Tool Co.
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John D. Muchow
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G05 - CONTROLLING REGULATING
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Fluid pressure monitoring safety system
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Patent number 4,017,053
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Issue date Apr 12, 1977
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Willis Oil Tool Co.
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Richard E. Wells
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Means to reset an actuator pilot valve
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Patent number 3,977,438
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Issue date Aug 31, 1976
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Willis Oil Tool Co.
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John D. Muchow
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Safety shut-off valve
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Patent number 3,958,592
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Issue date May 25, 1976
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Willis Oil Tool Co.
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Richard E. Wells
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...