4. Machines not elsewhere specified
  5. Material working, abrading, or founding machinery
  6. Element or attachment

Harold A. Trent

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Boring bit and method for manufacture thereof

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

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Boring tool or similar article

Machines not elsewhere specified – Material working – abrading – or founding machinery – Element or attachment
Patent

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Profile ID: LFUS-PAI-P-959429

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