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Cutting element
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Patent number 8,910,730
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Issue date Dec 16, 2014
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National-Oilwell Varco, L.P.
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Nigel D. Griffin
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C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...
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Rotary drill bit
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Patent number 6,481,511
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Issue date Nov 19, 2002
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Camco International (UK) Limited
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Terry R. Matthias
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B22 - CASTING POWDER METALLURGY
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Rotary drill bit design method
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Patent number 6,435,058
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Issue date Aug 20, 2002
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Camco International (UK) Limited
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Terry R. Matthias
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B22 - CASTING POWDER METALLURGY
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