Ferrous metal casting; non-ferrous metal alloy manufacturing; non-ferrous metal casting; metal material manufacturing; high-quality special steel material sales; metal material sales; hardware product manufacturing; hardware product wholesale; hardware product research and development; ordinary valve and cock manufacturing (excluding special equipment manufacturing); valve and cock sales; manufacturing of building decoration, water supply and drainage pipe fittings, and other building metal products; building metal accessory manufacturing; building metal accessory sales; automotive parts and accessory manufacturing; automotive parts research and development; automotive parts wholesale; automotive wheel manufacturing; gear and gearbox manufacturing; gear and gearbox sales; railway locomotive and rolling stock parts manufacturing; railway locomotive and rolling stock parts sales; pump and vacuum equipment sales; packaging services; fire-fighting equipment sales; environmental protection special equipment manufacturing; environmental protection special equipment sales; dust removal technology equipment manufacturing; rubber product sales; mold sales; rubber product manufacturing; mold manufacturing; metal waste and scrap processing; casting molding material production; casting molding material sales; seal manufacturing; seal sales; goods import and export; technology import and export.