4. Boring or penetrating the earth
  5. With signaling, indicating, testing or measuring
  6. Tool position direction or inclination measuring or...
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Brosnahan James Frederick

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Brune Guenter W.

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Bynum Jonathan R.

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Cartwright Jason Austin

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Catherall Roger

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Chia Christopher R.

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Clark Howard C.

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Clarke Ralph L.

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Colebrook Mark A.

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Cotten Steven A.

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Dawson Charles R.

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Den Norskestats Oljeselskap A.S.

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Digital Control Incorporated

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Dimitroff Ted R.

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Dolgin Benjamin

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Dreuilhe Claude

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Drews Steven W.

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Drilex UK Limited and Eastman Christensen Company

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Echocs Brigitte Jeffery

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Encore Drilling Limited

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