4. Boring or penetrating the earth
  5. With means movable relative to tool to receive, retain, or...
  6. Core-retaining or severing means
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Andresen Arild A.

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Andresen Arilo A.

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Bartette Pascal

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Clemens Gary W.

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Diedrich John C.

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Diedrich Drilling Equipment, Inc.

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Driver W. B.

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Easton Andrew R.

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Edmonson Clarence D.

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Fanuel Philippe

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Ford George A.

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Hong Sung-Wan

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James Christopher A.

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Kim Young-Chin

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Looijen Peter N.

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Norton Christensen, Inc.

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Omega Tools International

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Ormsby Ronald D.

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R. C. Ltd.

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Sollie Steinar

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