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Filter for a drill string
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Patent number 7,303,029
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Issue date Dec 4, 2007
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Intelliserv, Inc.
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David R. Hall
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E21 - EARTH DRILLING MINING
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Downhole tool
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Patent number 7,193,526
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Issue date Mar 20, 2007
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Intelliserv, Inc.
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David R. Hall
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G01 - MEASURING TESTING
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Swivel assembly
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Patent number 7,193,527
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Issue date Mar 20, 2007
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Intelliserv, Inc.
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David R. Hall
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G01 - MEASURING TESTING
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Internal coaxial cable seal system
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Patent number 7,080,998
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Issue date Jul 25, 2006
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Intelliserv, Inc.
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David R. Hall
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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