4. Boring or penetrating the earth
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  6. Rolling cutter bit or rolling cutter bit element
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Koltermann Terry

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Koltermann Terry J.

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Kondratenko Feofan Ilich

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Konstantinov Leonid Pavlovich

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Kreck John J.

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Kristiansen Steffen S.

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Kuhn Karl O.

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Kulkarni Ajay V.

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Lacey Patrick J.

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Lamage Limited

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Lambson Roger S.

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Langford, Jr. James Wilson

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Lays Roger

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Lee Ernie J.

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Lefort Guy James

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Leisey Jeffrey D.

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Lema Raul E.

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Lenaburg Carl E.

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Ley Ted M.

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Li Ai Jun

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