4. Metal treatment
  5. Compositions
  6. Heat treating

C. I. Hayes Inc.

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Apparatus for heat treating drill blanks

Metallurgical apparatus – Means treating solid metal – By contact with gas
Patent

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Apparatus for quenching substantially flat workpieces

Metallurgical apparatus – Having means for contacting a solid metalliferous material...
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Method of vacuum carburizing

Metal treatment – Compositions – Heat treating
Patent

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