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

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

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Drill bit assembly for fluid-operated percussion drill tools

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

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Drill bit retainer for a down hole hammer assembly

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

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Drill hammer assembly

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

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Drill head for directional boring

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

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Drill string jarring and bumping tool with piston disconnect

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

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Drilling device with hydraulic percussion generator for earth dr

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

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Drilling method and measurement-while-drilling apparatus and...

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

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