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

Hubert W. Penka, Jr.

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Drill bit and cutter having insert clusters and method of...

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

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Hardfaced drill bit structures and method for making such...

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

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Profile ID: LFUS-PAI-P-2618055

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