4. Metal treatment
  5. Process of modifying or maintaining internal physical...
  6. Chemical-heat removing or burning of metal

James David Carrigan

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Archimedes spiral drill bit

Boring or penetrating the earth – Bit or bit element – With fluid conduit lining or element
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Method of flame hardening gears

Metal treatment – Process of modifying or maintaining internal physical... – Chemical-heat removing or burning of metal
Patent

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Profile ID: LFUS-PAI-P-22765

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