Metal treating; treating of metal, namely, metal stamping; surface finishing of metal articles, namely, metal treatment; metal casting; metallurgical smelting, namely, refining of metals; metal melting services; treatment of slag arising from metal casting; metalworking; millworking; metalworking, namely, turning and lathing of metal and steel; production of grey cast irons, spheroidal cast irons, alloyed cast irons, namely, metal casting