4. Boring or penetrating the earth
  5. Processes
  6. Sampling of earth formations
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Down-the-hole motor for rotary drill rod and process for drillin

Boring or penetrating the earth – Processes – Sampling of earth formations
Patent

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Downhole core barrel flushing system

Boring or penetrating the earth – Processes – Sampling of earth formations
Patent

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Drill for making wide diameter and high depth holes and...

Boring or penetrating the earth – Processes – Sampling of earth formations
Reexamination Certificate

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Drilling nipple gas trap

Boring or penetrating the earth – Processes – Sampling of earth formations
Patent

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Drilling system and method suitable for coring and other...

Boring or penetrating the earth – Processes – Sampling of earth formations
Reexamination Certificate

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