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Wellhead expansion assembly
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Patent number 4,582,132
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Issue date Apr 15, 1986
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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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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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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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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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