4. Boring or penetrating the earth
  5. Bit or bit element
  6. With bit guide or bore wall compacting device
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Rotary drill bits

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

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Rotary drill bits employing tandem gage pad arrangement

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

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Rotary drill bits for directional drilling employing tandem...

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

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Rotary-type earth boring drill bit, modular bearing pads...

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

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