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

Bengt Åsberg

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Drill bit

Machines not elsewhere specified – Material working – abrading – or founding machinery – Element or attachment
Design Patent

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Overburden drilling apparatus having a down-the-hole hammer...

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Reexamination Certificate

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Percussive down-the-hole hammer and a piston and drill bit...

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

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Rock drill bit having retrac teeth and method for its...

Boring or penetrating the earth – Bit or bit element – Cutting edges facing in opposite axial directions
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2098317

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