4. Boring or penetrating the earth
  5. With means movable relative to tool or shaft to control...
  6. Valve prevents upward flow
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Fidtje Torbjörn H.

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Jeter John D.

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Lang Alan F.

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Layton Larry H.

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McKay Don C.

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Reed Rock Bit Company

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Smart Drilling and Completion, Inc.

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Trevino, Jr. Joe

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