4. Boring or penetrating the earth
  5. Processes
  6. Sampling of earth formations

Eastman Christensen Co

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Method and apparatus for coring with an in situ core barrel spon

Boring or penetrating the earth – Processes – Sampling of earth formations
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Stabilizer for navigational drilling

Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along... – Axially spaced opposed bore wall engaging guides
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