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Force monitoring tractor
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Patent number 8,905,148
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Issue date Dec 9, 2014
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Schlumberger Technology Corporation
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Keith R. Nelson
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E21 - EARTH DRILLING MINING
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Self-aligning open-hole tractor
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Patent number 8,770,303
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Issue date Jul 8, 2014
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Schlumberger Technology Corporation
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Franz Aguirre
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E21 - EARTH DRILLING MINING
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Grip enhanced tractoring
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Patent number 8,602,115
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Issue date Dec 10, 2013
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Schlumberger Technology Corporation
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Franz Aguirre
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E21 - EARTH DRILLING MINING
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Passive centralizer
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Patent number 7,775,272
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Issue date Aug 17, 2010
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Schlumberger Technology Corporation
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Keith Nelson
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E21 - EARTH DRILLING MINING
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