4. Boring or penetrating the earth
  5. Bit or bit element
  6. Noncutting portion forwardly of cutting portion
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Rotary drill bits for directional drilling employing tandem gage

Boring or penetrating the earth – Bit or bit element – Noncutting portion forwardly of cutting portion
Patent

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Rotary drill bits for directional drilling employing tandem...

Boring or penetrating the earth – Bit or bit element – Noncutting portion forwardly of cutting portion
Reexamination Certificate

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