LandOfFree - US Patents - Listing for Boring or penetrating the earth,With tool shaft detail

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D.T.A. Pty. Ltd.

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Dahlgren Scott S.

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Dailey Petroleum

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Dawe Stephen G.

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DCD, Ltd.

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DeBray Harold J.

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Delwiche Robert A.

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Deschutter Rene

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Dewar John U.

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Dewey Charles H.

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Diamant Boart Stratabit S.A.

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Donse Lennart

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Dopf Anthony Robert

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Dorleans Andre

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Drilltech Services (ASIA) Pte Limited

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Drilltech Services (North Sea), Ltd.

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Dudman Roy L.

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Duscha Helmut

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