General items: Manufacturing of power distribution switch control equipment; Sales of distribution switch control equipment; Manufacturing of electrical facilities equipment; Manufacturing of mechanical and electrical equipment; Sales of electrical machinery and equipment; R & D of distribution switch control equipment; Manufacturing of power electronics components; Sales of power electronics components; Manufacturing of electromechanical instruments, transmission and distribution and control equipment; Manufacturing of household appliances; Sales of electromechanical instrumentation, sales of instrumentation; Manufacturing of electronic components; Retail sales of electronic components; Sales of metal chains and other metal products, sales of mechanical parts and parts (except for projects that are required to be approved by law, independently conduct business activities according to a business license). Licensing items: Import and export of goods; Import and export of technology (projects that are subject to approval in accordance with the law, can only carry out operational activities after approval by the relevant departments, based on the results of the approval).