LandOfFree - US Patents - Listing for Boring or penetrating the earth,Bit or bit element

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Dively Charles R.

Inventor

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Dixon Richard H.

Inventor

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Dogherty Jennifer

Examiner

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Dolezal George E.

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Domani Guenther

Inventor

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Donaghy John K.

Attorney

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Doofor Oy

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Dorosz Daniel E. D.

Inventor

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Dorosz Dennis D. E.

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Dourfaye Alfazazi

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Drake David E.

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Drake Eric F.

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DreBo Werkzeugfabrik GmbH

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Dreps Klaus

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Dresser Indistries

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Drill Services, Inc.

Corporate Assignee

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Drilling & Service U.K. Limited

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Driltech Mission LLC

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Drivdahl K. Shayne

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Drivdahl Kristian S.

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