4. Boring or penetrating the earth
  5. Bit or bit element
  6. Nonsymmetrical bit

Otto R. Staroba

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Button drill bit structure

Boring or penetrating the earth – Bit or bit element – Nonsymmetrical bit
Patent

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Retainer for holding mineral cutter in a tool-box

Mining or in situ disintegration of hard material – Miscellaneous
Patent

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Profile ID: LFUS-PAI-P-1403892

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