4. Boring or penetrating the earth
  5. Bit or bit element
  6. Forked rotary nontracking
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Drag-bit drilling with multi-axial tooth inserts

Boring or penetrating the earth – Bit or bit element – Forked rotary nontracking
Reexamination Certificate

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Drill bit

Boring or penetrating the earth – Bit or bit element – Forked rotary nontracking
Reexamination Certificate

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Drill bit having combined positive and negative or neutral rake

Boring or penetrating the earth – Bit or bit element – Forked rotary nontracking
Patent

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Rotary drill bit having drag cutting elements

Boring or penetrating the earth – Bit or bit element – Forked rotary nontracking
Patent

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Rotary drill bits

Boring or penetrating the earth – Bit or bit element – Forked rotary nontracking
Patent

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