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Downhole jack assembly sensor
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Patent number 8,499,857
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Issue date Aug 6, 2013
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Schlumberger Technology Corporation
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David R. Hall
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E21 - EARTH DRILLING MINING
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Clutch for a jack element
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Patent number 8,307,919
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Issue date Nov 13, 2012
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Schlumberger Technology Corporation
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David R. Hall
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E21 - EARTH DRILLING MINING
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Downhole drive shaft connection
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Patent number 7,900,720
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Issue date Mar 8, 2011
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Schlumberger Technology Corporation
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David R. Hall
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E21 - EARTH DRILLING MINING
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Clutch for a jack element
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Patent number 7,866,416
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Issue date Jan 11, 2011
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Schlumberger Technology Corporation
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David R. Hall
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E21 - EARTH DRILLING MINING
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Downhole jack assembly sensor
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Patent number 7,721,826
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Issue date May 25, 2010
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Schlumberger Technology Corporation
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David R. Hall
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E21 - EARTH DRILLING MINING
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Downhole steering
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Patent number 7,559,379
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Issue date Jul 14, 2009
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David R. Hall
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E21 - EARTH DRILLING MINING
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Downhole turbine
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Patent number 7,451,835
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Issue date Nov 18, 2008
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David R. Hall
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E21 - EARTH DRILLING MINING
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Downhole turbine
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Patent number 7,434,634
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Issue date Oct 14, 2008
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David R. Hall
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E21 - EARTH DRILLING MINING
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