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

Jonathan Ryan Prill

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Drive shaft assembly for a downhole motor

Rotary shafts – gudgeons – housings – and flexible couplings for ro – Flexible coupling between fluid-conducting rotary shafts
Reexamination Certificate

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Hydraulic jar and an overpressure relief mechanism therefor

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

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Profile ID: LFUS-PAI-P-3254697

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