Hardware product research and development; hardware product manufacturing; hardware product wholesale; hardware product retail; steel rolling processing; mechanical parts and parts processing; mechanical parts and parts sales; household appliance research and development; household appliance manufacturing; household appliance sales; household appliance spare parts sales; household appliance installation services; mechanical and electrical equipment Equipment manufacturing; sales of mechanical and electrical equipment; manufacturing of non-electric household appliances; sales of non-electric household appliances; production of gas appliances; motor manufacturing; manufacturing of gas, liquid separation and purification equipment; sales of gas, liquid separation and purification equipment; repair of daily appliances; retail of daily household appliances; sales of metal materials; daily necessities made of metal Manufacturing; manufacturing of special equipment for commerce, catering, and services; sales of special equipment for commerce, catering, and services; manufacturing of sanitary ware; sales of sanitary ware; research and development of sanitary ware; research and development of kitchenware, sanitary ware, and daily sundries; wholesale of kitchenware, sanitary ware, and daily sundries; retail of kitchenware, sanitary ware, and daily sundries; mold manufacturing; mold sales; home furnishings Furniture manufacturing; Furniture sales; Furniture spare parts production; Furniture spare parts sales; Furniture installation and repair services; Auto parts and accessories manufacturing; Auto parts retail; Professional design services; Technical services, technology development, technical consultation, technology exchange, technology transfer, technology promotion; Electric heating food processing equipment sales.