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

Salvador Espana

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Friction bearing rock bit and segment

Boring or penetrating the earth – With storage means for bit lubricant carried by bit or shaft
Patent

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Friction bearing rock bit and segment, and method for making the

Metal tools and implements – making – Blank or process – Drill
Patent

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Profile ID: LFUS-PAI-P-1246067

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