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High impact resistant tool
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Patent number 8,365,845
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Issue date Feb 5, 2013
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David R. Hall
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B02 - CRUSHING, PULVERISING, OR DISINTEGRATING PREPARATORY TREATMENT OF GRAIN...
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Downhole lubrication system
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Patent number 8,141,662
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Issue date Mar 27, 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 lubrication system
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Patent number 8,020,637
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Issue date Sep 20, 2011
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Schlumberger Technology Corporation
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David R. Hall
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E21 - EARTH DRILLING MINING