Special equipment manufacturing. General items: instrument manufacturing, instrument sales, instrument repair, general equipment repair, specialized equipment repair, engineering management services, engineering technical services (excluding planning management, survey, design, and supervision), industrial engineering design services, building material sales, high-quality special steel material sales, technical services, technology development, technical consultation, technical exchange, technology transfer, technology promotion, information technology consulting services, goods import and export, technology import and export, pump and vacuum equipment manufacturing, pump and vacuum equipment sales, motor manufacturing, general valve and cock manufacturing (excluding special equipment manufacturing), valve and cock sales, metal material sales, mechanical parts and components processing, mechanical parts and components sales, electronic measuring instrument manufacturing, electronic measuring instrument sales, experimental analytical instrument sales, metal surface treatment and heat treatment processing, metal processing machinery manufacturing, machine tool functional parts and accessories sales, mechanical equipment research and development, mechanical equipment sales, general mechanical equipment installation services, electronic and mechanical equipment maintenance (excluding special equipment), special equipment sales, electrical equipment sales, electrical equipment repair, mechanical and electrical equipment manufacturing, mechanical and electrical equipment sales, power electronic component manufacturing, power electronic component sales, general parts manufacturing, seal manufacturing, seal sales, communication equipment manufacturing, communication equipment sales, software development, software sales, information system integration services, information system operation and maintenance services, network technology services, IoT application services, IoT technology services, industrial internet data services, foreign contracted projects, road freight transport of general cargo vehicles with a total mass of 4.5 tons or less (excluding network freight and dangerous goods), loading and unloading, safety consulting services, labor services (excluding labor dispatch), non-residential real estate leasing.