4. Boring or penetrating the earth
  5. Bit or bit element
  6. Nonsymmetrical bit
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Bi-center drill bit

Boring or penetrating the earth – Bit or bit element – Nonsymmetrical bit
Reexamination Certificate

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Boring head and bit protective collar

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

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Button drill bit structure

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

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