Manufacturing of material handling equipment; manufacturing of special equipment (excluding licensed special equipment); sales of mechanical equipment; sales of special equipment for oil drilling; technical services, technical development, technical consulting, technical exchange, technology transfer, and technology promotion; research and development of mechanical equipment; sales of pumps and vacuum equipment; manufacturing of special equipment for oil refining and chemical production; manufacturing of general equipment (excluding special equipment); manufacturing of hydraulic power machinery and components; manufacturing of pumps and vacuum equipment; manufacturing of mining machinery; sales of mining machinery; research and development of valves and cocks; maintenance of electronic and mechanical equipment (excluding special equipment); safety technical training for special operations personnel; leasing of special equipment; manufacturing of special equipment for oil drilling; sales of special equipment for oil refining and chemical production; engineering technical services (excluding planning management, survey, design, and supervision); technical services for oil and gas; research and development of new material technologies; manufacturing of mechanical and electrical equipment; sales of hydraulic and pneumatic components and systems; manufacturing of metal structures; metal surface treatment and heat treatment processing; manufacturing of hardware products; sales of metal products; sales of special equipment; sales of metal tools; industrial engineering design services; sales of mechanical parts and components; wholesale of automotive parts; repair of instruments and meters; sales of instruments and meters; wholesale of hardware products; leasing services for small and micro passenger cars; leasing of mechanical equipment; leasing of construction machinery and equipment; leasing services (excluding licensed leasing services); sales of coatings (excluding hazardous chemicals); sales of anti-corrosion materials; sales of thermal and sound insulation materials; sales of building blocks; sales of steel bars for construction; repair of general equipment; repair of special equipment. Licensed projects: manufacturing of road motor vehicles; design of special equipment; inspection and testing of special equipment; design of construction engineering; installation, renovation, and repair of special equipment; manufacturing of special equipment; construction engineering construction; construction labor subcontracting.