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Earth boring drill bit with shell supporting an external drillin

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

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Earth boring drill bit with shell supporting an external drillin

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

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Elements faced with superhard material

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

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Elements faced with superhard material

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

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Enhanced gage protection for milled tooth rock bits

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

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