Special equipment manufacturing (excluding licensed professional equipment manufacturing); special equipment repair; photovoltaic equipment and component manufacturing; metal structure manufacturing; building material sales; mechanical and electrical equipment sales; photovoltaic equipment and component sales; metal surface treatment and heat treatment processing; mechanical equipment sales; technical services, technical development, technical consulting, technical exchange, technology transfer, technology promotion; supply chain management services; metal structure sales; bearing, gear and transmission component sales; mining machinery manufacturing; mining machinery sales; tunnel construction special machinery manufacturing; tunnel construction special machinery sales; bearing manufacturing; bearing, gear and transmission component manufacturing; bearing sales; material handling equipment manufacturing; material handling equipment sales; mechanical and electrical equipment manufacturing; construction steel bar product sales; intelligent basic manufacturing equipment manufacturing; intelligent basic manufacturing equipment sales; software development; mechanical parts and components sales; industrial automatic control system device sales; artificial intelligence application software development; mechanical equipment leasing; mining industry high-efficiency energy-saving technology research and development; mechanical equipment research and development; mechanical parts and components processing; metal processing machinery manufacturing; non-residential real estate leasing; road freight transportation of general cargo vehicles with total mass of 4.5 tons and below (excluding network freight and dangerous goods).