Industrial automation equipment, non-destructive testing equipment and accessories, shot blasting equipment and accessories, instruments, meters, rail transit equipment, railway vehicle maintenance work platforms, steel column track bridge equipment, steel structures, pipeline parts, supports and hangers, air doors, valves, environmental protection dust removal equipment design, manufacturing, sales, and installation; Steel sales. General items: Testing machine sales; Testing machine manufacturing; Railway special measuring or testing instrument sales; Metal forming machine tool sales; Intelligent instrument sales; Communication equipment sales; Mechanical equipment sales; Network equipment sales; Special equipment sales; Special equipment repair; General equipment repair; Railway special measuring or testing instrument manufacturing; Metal structure sales; Technical services, technical development, technical consulting, technical exchange, technology transfer, technology promotion; Import and export of goods; Import and export of technology; Import and export agency; Environmental protection special equipment manufacturing; Environmental protection special equipment sales; Metal structure manufacturing; Intelligent port handling equipment sales; Intelligent material handling equipment sales; Intelligent warehousing equipment sales; Material handling equipment manufacturing; Material handling equipment sales; Electronic special equipment sales; Network technical services; Internet of Things technical services; Network and information security software development; Internet equipment sales; Software development; Information system integration services; Intelligent control system integration; Artificial intelligence industry application system integration services.