4. Boring or penetrating the earth
  5. Bit or bit element
  6. Cutting edges facing in opposite axial directions

Bertil Ederyd

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Portion of a drill bit

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

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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-2526736

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