gas cyaniding

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Case hardening — or surface hardening is the process of hardening the surface of a metal, often a low carbon steel, by infusing elements into the material s surface, forming a thin layer of a harder alloy. Case hardening is usually done after the part in question … Wikipedia
Mitchells Creek — Goldfield is claimed[by whom?] to be Australia s first goldfield. It is located at Bodangora near Wellington, New South Wales. Gold was apparently first found in this area by a shepherd called McGregor in Mitchell’s Creek on the Montefiore s… … Wikipedia

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