4. Boring or penetrating the earth
  5. With tool drive prime mover or above-ground mechanical...
  6. With installing casing

Ian Graeme Rear

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Down hole hammer assembly

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With installing casing
Patent

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Down-hole hammer

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

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Drill rod stabilizing tool

Cutlery
Patent

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Fluid operated hammer

Tool driving or impacting – Drive controlled by relative axial movement of tool – Drive motor controlled
Patent

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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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Profile ID: LFUS-PAI-P-309078

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