4. Boring or penetrating the earth
  5. Bit or bit element
  6. With bit guide or bore wall compacting device
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Stabilizing system and methods for a drill bit

Boring or penetrating the earth – Bit or bit element – With bit guide or bore wall compacting device
Reexamination Certificate

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Steerable rotary drag bit with longitudinally variable gage aggr

Boring or penetrating the earth – Bit or bit element – With bit guide or bore wall compacting device
Patent

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