Manufacturing of construction machinery; sales of construction machinery; leasing of construction machinery and equipment; engineering and technical research and experimental development; sales of special equipment; manufacturing of environmental protection special equipment; sales of environmental protection special equipment; sales of security equipment; sales of automobiles; sales of fire-fighting equipment; technical services, technical development, technical consulting, technical exchange, technical transfer, and technical promotion; manufacturing of security equipment; fire-fighting technical services; manufacturing of metal products for safety and fire-fighting; leasing services (excluding licensed leasing services); leasing of machinery and equipment; housing leasing; leasing of transportation equipment; import and export of goods; import and export of technology. Licensed projects: manufacturing of special equipment; design of special equipment; inspection and testing of special equipment; installation, modification, and repair of special equipment; production of road motor vehicles; inspection and testing services.