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

Kenneth Ahlhorn

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Down-the-hole hammer drill having reverse circulation

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

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Percussive down-the-hole rock drilling hammer and piston therefo

Tool driving or impacting – Impacting devices – Selective axial direction of impact
Patent

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Precussive down-the-hole rock drilling hammer

Tool driving or impacting – Impacting devices – Selective axial direction of impact
Patent

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Profile ID: LFUS-PAI-P-141604

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