Installation, modification, and repair of special equipment; manufacture of special equipment; inspection and testing of special equipment; design of special equipment. General items: manufacture of specialized equipment (excluding licensed specialized equipment); manufacture of industrial robots; manufacture of metal processing machinery; manufacture of building metal accessories; manufacture of special operation robots; manufacture of railway locomotive and rolling stock parts; manufacture of mechanical and electrical equipment; manufacture of power facility equipment; manufacture of high-speed rail equipment and parts; processing of mechanical parts and components; spray coating processing; metal surface treatment and heat treatment processing; recycling of再生资源 (excluding production scrap metal); installation and repair of industrial robots; repair of electrical equipment; application software development for artificial intelligence; big data services; research and development of power distribution switchgear equipment; maintenance of electronic and mechanical equipment (excluding special equipment); sale of special equipment; manufacture of general equipment (excluding special equipment); sale of mechanical equipment; sale of intelligent unmanned aerial vehicles; manufacture of metal structures; sale of metal structures.