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

Nigel M. Page

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Rotary drill bit with lip seal in roller cone bit

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

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Sealing structure for a rock drill bit

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

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Profile ID: LFUS-PAI-P-2479684

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