4. Boring or penetrating the earth
  5. Below-ground impact members
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Make up system of a down-the-hole hammer

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

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Mechano-hydraulic double-acting drilling jar

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

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Method for performing ground or rock work and hydraulic...

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

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