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Pipe insert assembly
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Patent number 5,058,671
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Issue date Oct 22, 1991
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Lindsey Completion Systems, Inc.
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Chudleigh B. Cochran
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E21 - EARTH DRILLING MINING
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Well working rig
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Patent number 4,267,675
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Issue date May 19, 1981
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Brown; Joe R.
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Chudleigh B. Cochran
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E21 - EARTH DRILLING MINING
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Well packer
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Patent number 4,071,084
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Issue date Jan 31, 1978
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Brown Oil Tools, Inc.
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Joe R. Brown
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E21 - EARTH DRILLING MINING
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Swivel assembly
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Patent number 4,030,546
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Issue date Jun 21, 1977
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Brown Oil Tools, Inc.
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Jerry L. Rogers
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E21 - EARTH DRILLING MINING
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Well packer
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Patent number 4,018,274
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Issue date Apr 19, 1977
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Brown Oil Tools, Inc.
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Chudleigh B. Cochran
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E21 - EARTH DRILLING MINING
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Check valve assembly
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Patent number 3,973,587
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Issue date Aug 10, 1976
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Brown Oil Tools, Inc.
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Chudleigh B. Cochran
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E21 - EARTH DRILLING MINING
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