Manufacturing of special equipment; installation, modification, and repair of special equipment; road freight transport (excluding dangerous goods); filling of mobile pressure vessels/gas cylinders; production of road motor vehicles. General items: import and export of goods; import and export of technology; sales of special equipment; manufacturing of construction machinery; sales of construction machinery; leasing of special equipment; leasing of non-residential real estate; advertising production; advertising design and agency; steel rolling and processing; machining of mechanical parts and components; sales of mechanical parts and components; manufacturing of mechanical and electrical equipment; sales of mechanical and electrical equipment; manufacturing of cement products; sales of cement products; manufacturing of environmental protection special equipment; sales of environmental protection special equipment; manufacturing of mining machinery; sales of mining machinery; manufacturing of metal structures; sales of metal structures; leasing of construction machinery and equipment; technical services, development, consulting, exchange, transfer, and promotion; automobile sales; manufacturing of general parts; manufacturing of metal chains and other metal products; sales of metal chains and other metal products; manufacturing of industrial automatic control system devices; sales of industrial automatic control system devices; installation services for general mechanical equipment.