4. Boring or penetrating the earth
  5. Bit or bit element
  6. Bit with leading portion forming smaller diameter initial bore
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McCord, Jr. Wilfred M.

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Mumma Matthew D.

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Nelson Jack R.

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Pavey Harry W.

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Phillips Paul S.

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Presley W. Gregory

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Presley William Gregory

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Püttmann Franz-Josef

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Rebollido Henry

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ReedEycalog, L.P.

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Reedrill Inc.

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Robit Rocktools Ltd

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Roth Rudy

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Schimke Thomas O.

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Silva Roger

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Silva Rogerio H.

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Smith, Jr. Paul C.

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Spencer George

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Taylor Thomas Lee

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Tracto-Technik GmbH

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