4. Boring or penetrating the earth
  5. Bit or bit element
  6. Noncutting portion forwardly of cutting portion
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Beyer Leaman Rex

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Crooks Jay Camron Adam

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Dalier Paul H.

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Desai Neerali Janubhai

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Drill Services, Inc.

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Dykstra Mark W.

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Hutzell Clyde H.

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NQL Energy Services, Ltd.

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Sheffield Marion C.

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Wilson Steve B.

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