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

Glen Robinson

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Hydraulic motion compensating apparatus

Implements or apparatus for applying pushing or pulling force – Step-by-step traveling bar – Pawl actuated
Patent

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Well jar having a time delay section

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

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Profile ID: LFUS-PAI-P-1696983

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