4. Boring or penetrating the earth
  5. Bit or bit element
  6. Rolling cutter bit or rolling cutter bit element
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Dolezal George E.

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Donaghy John K.

Attorney

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Dorosz Daniel E. D.

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Dorosz Dennis D. E.

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Drake Eric F.

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Dresser Indistries

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Du Heng

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Duggan James L.

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Duggan James Lynn

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Dysart Theodore R.

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Dysart Theodore Rivers

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Eastman Christensen

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Eastman Christensen Co.

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Embury Philip D.

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Enever Kenneth D.

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Engtech SA

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Ensminger Jerry

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Erpenbeck Gary

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Estes Roy

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Estes Roy D.

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