4. Boring or penetrating the earth
  5. Below-ground impact members
  6. Fluid-operated

Minroc Technical Promotions Ltd.

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Reverse circulation down-the-hole hammer drill and bit therefor

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Segmented ring mounting for a fluid-operated percussion...

Joints and connections – Biased catch or latch – By separate spring
Reexamination Certificate

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Valveless down-the-hole drill

Tool driving or impacting – Drive controlled by relative axial movement of tool – Drive motor controlled
Patent

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Profile ID: LFUS-PAI-P-882063

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