4. Tool driving or impacting
  5. Drive controlled by relative axial movement of tool
  6. Drive motor controlled
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Holland Richard S.

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Kita John F.

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Kurt Ewald Heinz

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Kuvshinov Viktor A.

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Landmark West Ltd.

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Leavell Charles

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Mandanis Georges

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McCallops John A.

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Mechelke Klaus

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Meneghini Robert J.

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Musso Mario

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Okawa Tokan

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P. G. Drilling Equipment & Accessories

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Pate III William F.

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Percussion Drilling, Inc.

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Pillow Dan L.

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Radtke Gerd

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Raman Rune E. B.

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Ranck Gerald L.

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Rusin Sergei V.

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