4. Metal tools and implements, making
  5. Blank or process
  6. Drill

John Ramsay Crowe

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Method for hardfacing roller cone drill bit legs

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

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Method for hardfacing roller cone drill bit legs

Metal tools and implements – making – Blank or process – Drill
Reexamination Certificate

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Roller cone drill bit legs

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

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Profile ID: LFUS-PAI-P-2805048

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