4. Boring or penetrating the earth
  5. Bit or bit element
  6. Rolling cutter bit or rolling cutter bit element
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Crider Thillmon F.

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Crouse Richard D.

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Cypress Services, Inc.

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Daly Jeffery E.

Representative

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Damschen Michael S.

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Damschen Michael Steven

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Davis Randy C.

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Dawelbeit Kamal

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Deane John D.

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Debo William L.

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deRimanoczy Dean Peter

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Desjardins Donald A.

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Dickerhoff Ronald P.

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Dickey Winton B.

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Dickey Winton B.

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Dietz Wesley P.

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Dillard Walter S.

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Dimond Carl Edward

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Dively Charles R.

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Dogherty Jennifer

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