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

Joseph J. Portugal

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Method of forming closely sized openings

Metal treatment – Compositions – Heat treating
Patent

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Rock drilling bit and a method of producing the same

Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet
Patent

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Rock drilling bit and a method of producing the same

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

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Profile ID: LFUS-PAI-P-578734

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