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Well centralizer
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Patent number 9,297,218
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Issue date Mar 29, 2016
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Blackhawk Specialty Tools, LLC
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J. Christopher Jordan
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Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
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Annular pressure release sub
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Patent number 9,181,777
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Issue date Nov 10, 2015
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Weatherford Technology Holdings, LLC
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John Emile Hebert
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E21 - EARTH DRILLING MINING
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Well centralizer
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Patent number 9,127,519
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Issue date Sep 8, 2015
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J. Christopher Jordan
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Y10 - TECHNICAL SUBJECTS COVERED BY FORMER USPC
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