4. Boring or penetrating the earth
  5. Bit or bit element
  6. Rolling cutter bit or rolling cutter bit element

Glenn L. Allison

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Method and apparatus for multilateral junction

Wells – Processes – Parallel string or multiple completion well
Reexamination Certificate

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Reamer-stabilizer

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Patent

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Reamer-stabilizer

Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft – With fluid pressure-actuated feed means
Patent

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Rotary drilling head assembly

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – Rotary drive for a relatively advancing tool
Reexamination Certificate

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Profile ID: LFUS-PAI-P-783452

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