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Keel guide system
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Patent number 7,156,039
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Issue date Jan 2, 2007
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FMC Technologies, Inc.
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Robert Alan Charnock
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E21 - EARTH DRILLING MINING
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Casing hanger
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Patent number 6,095,242
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Issue date Aug 1, 2000
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FMC Corporation
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Huy Lequang
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E21 - EARTH DRILLING MINING
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Adjustable casing hanger
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Patent number 5,878,816
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Issue date Mar 9, 1999
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FMC Corporation
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Richard C. Lalor
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E21 - EARTH DRILLING MINING
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Inside blowout preventer
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Patent number 4,403,628
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Issue date Sep 13, 1983
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Wood George & Company
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Amrik S. Nijjar
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E21 - EARTH DRILLING MINING