4. Tool driving or impacting
  5. Automatic control of power operated means
  6. Tool advance causing or controlling means
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Drilling Technology Research Institute of Shengli Oilfield

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Dynadrill, Inc.

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Elmer Stefan

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Evarts Kingsley S.

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Fendo Oy

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Findeli Bernard

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Firma Schmid & Wezel

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Frederick Leonard L.

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Fridie Willmon J.

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Fridie, Jr. Willmong22

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Fujikawa Kozo

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Fukase Yutaka

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Fulkerson David Wilham

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Fulmer Donald W.

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Gann Steven N.

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Gidlund Lennart Erik Idoft

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Gluskin Richard S.

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Goldelius Rainer

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Goldsberry Emory G.

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Greigg Edwin E.

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