Manufacturing, Furnaces, automatic, metal heat treatment, Machinery and equipment for metalworking, Metals, Machinery & Engineering, Furnaces, shaft and gun barrel heat treatment, Furnaces, steel and ferrous alloy hardening and tempering, Furnaces, continuous, for heat treatment of metal strip or wire, Furnaces, continuous, metal heat treatment, Furnaces for brazing, welding and sintering, Furnaces, nitriding