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Power tong wrench
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Patent number 6,082,225
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Issue date Jul 4, 2000
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Canrig Drilling Technology, Ltd.
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Allan S. Richardson
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E21 - EARTH DRILLING MINING
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Portable top drive
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Patent number 6,024,181
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Issue date Feb 15, 2000
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Nabors Industries, Inc.
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Allan S. Richardson
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E21 - EARTH DRILLING MINING
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Portable top drive
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Patent number 5,755,296
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Issue date May 26, 1998
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Nabors Industries, Inc.
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Allan S. Richardson
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E21 - EARTH DRILLING MINING
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