4. Boring or penetrating the earth
  5. With tool shaft detail
  6. Shaft carried guide or protector
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R.C.R. Oilfield, Inc.

Corporate Assignee

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Radich Peter James

Inventor

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Raihert Ludvig A.

Inventor

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Ramsey Rickey H.

Inventor

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Raney Richard C.

Representative

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Rastegar Gholam Hossein

Inventor

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Reed Mining Tools, Inc.

Corporate Assignee

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Reullon Christophe

Inventor

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Roberts Paul

Inventor

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Roddy John

Inventor

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Rotary Drilling Technology, LLC

Corporate Assignee

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Rountree Steven P.

Inventor

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Rowe Larry F.

Inventor

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Russo Robert L.

Inventor

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