4. Boring or penetrating the earth
  5. Means traveling with tool to constrain tool to bore along...
  6. Normally curved guide or shaft

James Estep

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Bottom hole assembly for directional drilling

Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along... – Normally curved guide or shaft
Patent

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Method and apparatus for removing cuttings

Boring or penetrating the earth – Automatic control – In response to drilling fluid circulation
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1508366

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