4. Metal treatment
  5. Process of modifying or maintaining internal physical...
  6. Carburizing or nitriding using externally supplied carbon or...

JH Corporation

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Vacuum carburizing method and device, and carburized products

Metal treatment – Process of modifying or maintaining internal physical... – Carburizing or nitriding using externally supplied carbon or...
Patent

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Vacuum heat-treatment apparatus

Heating – Work feeding – agitating – discharging or conveying...
Reexamination Certificate

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