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

Patrick Purcell

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Reverse circulation down-the-hole drill

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With tool shaft having plural passages for drilling fluid
Patent

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Reverse circulation down-the-hole hammer drill and bit therefor

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

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Profile ID: LFUS-PAI-P-882061

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