4. Boring or penetrating the earth
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  6. Rolling cutter bit or rolling cutter bit element
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Chellappa Sudarsanam

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Chen Zhihua

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Chia Weng-Kwen R.

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Choe Heeman

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Chunn Gary

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Chuply Vladimir Yakovlevich

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Cisneros Dennis

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Cledisc International B.V.

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Cledisc International BV

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Clinkscales Douglas J.

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Cloud John D.

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Coates J. Randall

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Cobbs David C.

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Cobbs James H.

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Conroy David A.

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Cooper Thomas W.

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Crawford Michael Burl

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Crawford Micheal B.

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Crawley Dolph

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Crawley Dolph R.

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