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Electrically operated well tools
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Patent number 7,640,989
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Issue date Jan 5, 2010
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Halliburton Energy Services, Inc.
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Jimmie R. Williamson, Jr.
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E21 - EARTH DRILLING MINING
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Safety valve with extension springs
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Patent number 7,597,149
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Issue date Oct 6, 2009
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Halliburton Energy Services, Inc.
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Jimmie R. Williamson, Jr.
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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