4. Tool driving or impacting
  5. Automatic control of power operated means
  6. Tool advance causing or controlling means
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Daiichi Dentsu, K.K.

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DePagter Glenn F.

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Deutsche Gardner-Denver G.m.b.H.

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Deutsche Gardner-Denver GmbH

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Drilling Technology Research Institute of Shengli Oilfield

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Dynadrill, Inc.

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