Manufacturing of power electronic components; sales of power electronic components; manufacturing of mechanical and electrical equipment; sales of electrical machinery equipment; manufacturing of pumps and vacuum equipment; sales of pumps and vacuum equipment; manufacturing of electric motors; manufacturing of fans; manufacturing of fans and fans; sales of fans and fans; manufacturing of general equipment (excluding manufacturing of special equipment); manufacturing of gas compression machinery; sales of gas compression machinery; manufacturing of metal cutting and welding equipment; sales of metal cutting and welding equipment; manufacturing of metal processing machinery; R&D of valves and cocks Sales of valves and cocks; Manufacturing of building decoration, plumbing pipe parts and other construction metal products; Manufacturing of hardware products; Retailing of hardware products; Manufacturing of pneumatic and electric tools; Sales of pneumatic and electric tools; Manufacturing of auto parts and accessories; Wholesale of auto parts; Manufacturing of motorcycle parts; Retailing of motorcycles and spare parts; Sales of micro motors and components; Manufacturing of transformers, rectifiers and inductors; Manufacturing of general parts; Manufacturing of mechanical parts and parts; Sales of mechanical parts and parts. Licensed items: import and export of goods; import and export of technology.