General items: Valve and cock sales, pump and vacuum equipment sales; Industrial automatic control system device sales, plastic products sales, hardware products wholesale, hardware products retail; Forgings and powder metallurgy products sales; Seal sales; Sales of mechanical parts and spare parts; Fastener sales; Non-ferrous metal alloy sales; Sales of high-performance non-ferrous metals and alloy materials; Sales of metal materials, sales of metal products, sales of special equipment Import and export of goods: Technology import and export (except for the items subject to approval according to law, independently carry out business activities according to law with business licenses).