4. Boring or penetrating the earth
  5. Processes

David Gavia

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Rotary drag bit with multiple backup cutters

Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Reexamination Certificate

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Rotary drag bits having a pilot cutter configuraton and...

Boring or penetrating the earth – Processes
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2285305

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