4. Boring or penetrating the earth
  5. Below-ground impact members
  6. Fluid-operated
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Self-lubricating, fluid-actuated, percussive down-the-hole drill

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

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Single acting hydraulic fishing jar

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

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Sleeve valve hydraulic jar tool

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

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Soil displacement hammer with movable head

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

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Spline drive for percussion drilling tool

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

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