Gas, liquid separation and purification equipment manufacturing; gas, liquid separation and purification equipment sales; hydraulic power machinery and components manufacturing; hydraulic power machinery and components sales; oil drilling and production special equipment manufacturing; oil drilling and production special equipment sales; mechanical equipment research and development; mechanical equipment sales; technical services, technology development, technical consultation, technical exchange, technology transfer, technology promotion; new material technology research and development; oil refining and chemical production special equipment manufacturing; oil refining and chemical production special equipment sales; environmental protection special equipment manufacturing; environmental protection special equipment sales; general equipment manufacturing (excluding special equipment manufacturing); general equipment repair; special equipment sales; railway locomotive and rolling stock parts manufacturing; railway locomotive and rolling stock parts sales; mechanical parts and components processing; mechanical parts and components sales; engineering and technological research and experimental development; mechanical equipment leasing; special equipment leasing. Licensed items: Construction engineering design; special equipment design; special equipment manufacturing; special equipment installation, modification and repair; special equipment inspection and testing services; inspection and testing services; technology import and export; goods import and export.