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Well servicing rig
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Patent number 4,591,006
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Issue date May 27, 1986
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Chevron Research Company
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Stanley O. Hutchison
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E21 - EARTH DRILLING MINING
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Dome-type packoff wellhead
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Patent number 4,401,160
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Issue date Aug 30, 1983
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Chevron Research Company
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Glenn W. Anderson
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E21 - EARTH DRILLING MINING
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Jet device for use in wells
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Patent number 4,197,910
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Issue date Apr 15, 1980
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Chevron Research Company
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Stanley O. Hutchison
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E21 - EARTH DRILLING MINING
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Slant hole foam cleanout
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Patent number 4,187,911
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Issue date Feb 12, 1980
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Chevron Research Company
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Stanley O. Hutchison
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E21 - EARTH DRILLING MINING
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Packer cup assembly
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Patent number 4,129,308
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Issue date Dec 12, 1978
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Chevron Research Company
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Stanley O. Hutchison
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E21 - EARTH DRILLING MINING
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Material for impression packer
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Patent number 4,124,547
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Issue date Nov 7, 1978
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Chevron Research Company
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Stanley O. Hutchison
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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Field dressable inflatable packer
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Patent number 4,003,581
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Issue date Jan 18, 1977
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Chevron Research Company
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Stanley O. Hutchison
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Impression packer sleeve
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Patent number 3,983,906
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Issue date Oct 5, 1976
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Chevron Research Company
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Stanley O. Hutchison
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C08 - ORGANIC MACROMOLECULAR COMPOUNDS THEIR PREPARATION OR CHEMICAL WORKING-...
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