Manufacturing and maintenance of specialized electronic industrial equipment, magnetic particle flaw detection equipment, environmental protection equipment, switches for electronic equipment, and security monitoring alarm equipment; Import business of raw materials, instruments, meters, mechanical equipment, parts, and technologies required for the enterprise’s production and scientific research (excluding goods and technologies restricted or prohibited by the state); Technical services for electronic products, automation equipment, and software; Property leasing; Property management services; Design, manufacturing, sales, and maintenance of specialized tooling fixtures and lifting equipment for rail transit vehicle maintenance.