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Lead impression wear bushing
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Patent number 8,561,705
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Issue date Oct 22, 2013
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Vetvo Gray Inc.
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Thomas McCreath Wilson
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E21 - EARTH DRILLING MINING
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Drill pipe running tool
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Patent number 8,403,056
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Issue date Mar 26, 2013
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Vetco Gray Inc.
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Nicholas Gette
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E21 - EARTH DRILLING MINING
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Cuttings bed removal tool
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Patent number 7,882,903
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Issue date Feb 8, 2011
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BBJ Tools Inc.
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Robert Barnett
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E21 - EARTH DRILLING MINING
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-
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Internal bore impression tool
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Patent number 4,616,987
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Issue date Oct 14, 1986
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Vetco Offshore Industries, Inc.
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Charles L. Boyers
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B29 - WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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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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3918520
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Patent number 3,918,520
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Issue date Nov 11, 1975
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E21 - EARTH DRILLING MINING
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3905227
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Patent number 3,905,227
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Issue date Sep 16, 1975
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E21 - EARTH DRILLING MINING
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3855856
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Patent number 3,855,856
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Issue date Dec 24, 1974
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E21 - EARTH DRILLING MINING
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3070166
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Patent number 3,070,166
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Issue date Dec 25, 1962
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E21 - EARTH DRILLING MINING
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3049752
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Patent number 3,049,752
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Issue date Aug 21, 1962
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E21 - EARTH DRILLING MINING
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3046601
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Patent number 3,046,601
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Issue date Jul 31, 1962
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E21 - EARTH DRILLING MINING