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Wellbore wash nozzle system
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Patent number 6,189,618
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Issue date Feb 20, 2001
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Weatherford/Lamb, Inc.
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Robert S. Beeman
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E21 - EARTH DRILLING MINING
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Wellbore cutting tool
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Patent number 5,735,359
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Issue date Apr 7, 1998
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Weatherford/Lamb, Inc.
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Mark H. Lee
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E21 - EARTH DRILLING MINING
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Permanent whipstock
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Patent number 5,494,111
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Issue date Feb 27, 1996
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Baker Hughes Incorporated
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John P. Davis
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E21 - EARTH DRILLING MINING
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Retrievable whipstock system
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Patent number 5,474,126
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Issue date Dec 12, 1995
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Baker Hughes Incorporated
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Gerald D. Lynde
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E21 - EARTH DRILLING MINING