Installation and maintenance of gas burning appliances; production of electric heating food processing equipment; general electrical installation services: wholesale of kitchenware, sanitary ware and daily sundries; furniture installation and maintenance services; sales of non-metallic minerals and products; sales of metal materials; wholesale of hardware products; sales of metal products; retail of kitchenware, sanitary ware and daily sundries; daily household products E-commerce retail; sales of construction and decoration materials; sales of mechanical and electrical equipment; manufacturing of mechanical and electrical equipment; sales of special equipment for business, catering, and services; professional design services; graphic design; manufacturing of metal daily necessities; non-ferrous metal rolling processing; sales of mechanical equipment; research and development of mechanical equipment; entrepreneurial space services; production of gas appliances