4. Boring or penetrating the earth
  5. Below-ground impact members
  6. Fluid-operated
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Accelerator for fishing jar with hydrostatic assist

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

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Annular air hammer apparatus for drilling wells

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

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Annular air-hammer apparatus for drilling holes

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

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Apparatus for positioning a split retaining ring in a down-hole

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

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