4. Cutting by use of rotating axially moving tool
  5. Tool or tool with support
  6. Having inversely angled cutting edge

Rudolf Jungwirth

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Drill bit including one piece cutting head

Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Reexamination Certificate

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Roll-forged drill bit

Cutting by use of rotating axially moving tool – Tool or tool with support – Having inversely angled cutting edge
Patent

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Profile ID: LFUS-PAI-P-1897744

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