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

Quinn's Oilfield Supply Ltd.

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Process for making internally hardened tubes

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

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Thin-walled small-bore steel tube with case hardened internal su

Pipes and tubular conduits – Structure
Patent

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