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

Dwight A. Rife

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Method for constructing a multiple segment rock bit

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

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Rotary drill bit multiple seal assembly

Seal for a joint or juncture – Seal between relatively movable parts – Relatively rotatable radially extending sealing face member
Patent

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Seal protector for a sealed bearing rock bit

Cutlery
Patent

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Profile ID: LFUS-PAI-P-1268459

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