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

Guy James Lefort

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Roller cone bit with improved seal gland design

Boring or penetrating the earth – Processes
Reexamination Certificate

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Roller cone bit with improved seal gland design

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

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Profile ID: LFUS-PAI-P-2093987

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