Production of electric heating food processing equipment; production of disinfection equipment; installation and maintenance of gas combustion appliances; wholesale of publications; retail of publications; internet sales of publications; construction engineering construction; interior decoration. General items: Manufacture of metal daily necessities; manufacture of special equipment for commerce, catering, and services; sales of special equipment for commerce, catering, and services; production of gas appliances; manufacture of refrigeration and air conditioning equipment; manufacture of environmental protection special equipment; sales of environmental protection special equipment; wholesale of kitchen, bathroom, and daily necessities; retail of kitchen, bathroom, and daily necessities; research and development of kitchen, bathroom, and daily necessities; sales of electric heating food processing equipment; sales of metal products; sales of office equipment; sales of refrigeration and air conditioning equipment; manufacture of high-speed rail equipment and accessories; sales of high-speed rail equipment and accessories; manufacture of railway locomotive and rolling stock accessories; sales of railway locomotive and rolling stock accessories; sales of railway transportation infrastructure equipment; electronic and mechanical equipment maintenance (excluding special equipment); technical services, technical development, technical consulting, technical exchange, technology transfer, technology promotion; leasing of non-residential real estate; professional design services; graphic design; industrial engineering design services.