Installation and maintenance of gas burning appliances; warehousing services for goods under customs supervision (excluding hazardous chemicals and dangerous goods). General projects: manufacturing of non-electric household appliances; manufacturing of household appliances; manufacturing of refrigeration and air-conditioning equipment; manufacturing of mechanical and electrical equipment; research and development of household appliances; production of gas appliances; manufacturing of architectural decoration, plumbing parts and other metal products for construction; research and development of hardware products; software development; repair of general equipment; repair of daily appliances; general cargo warehousing services (excluding hazardous chemicals and other items requiring license approval); technical services, technology development, technical consultation, technology Communication, technology transfer, technology promotion; sales of non-electric household appliances; sales of household appliances; sales of mechanical parts and components; sales of refrigeration and air-conditioning equipment; sales of mechanical and electrical equipment; retail of hardware products; wholesale of hardware products; sales of household appliances and spare parts; retail of daily household appliances; wholesale of kitchenware and sanitary ware and daily sundries; domestic trade agency; import and export agency; import and export of goods; technology import and export; packaging services; conference and exhibition services; and socioeconomic consulting services.