Special equipment manufacturing; Special equipment design; Installation, repair, and testing of power transmission, power supply, and power receiving electrical facilities; Electrical installation services; Road freight transport (excluding dangerous goods); Special equipment inspection and testing; Special equipment installation, modification, and repair; Construction labor subcontracting. General items: Special equipment manufacturing (excluding licensed professional equipment manufacturing); Transformer, rectifier, and inductor manufacturing; Power facility equipment manufacturing; Mechanical and electrical equipment manufacturing; Mechanical and electrical equipment sales; Special equipment sales; Power distribution switchgear equipment manufacturing; Power distribution switchgear equipment sales; Power distribution switchgear equipment research and development; Intelligent power transmission and distribution and control equipment sales; Road freight transport of ordinary cargo vehicles with a total mass of 4.5 tons or less (excluding online freight and dangerous goods); Power facility equipment sales; High-efficiency energy-saving technology research and development for the power industry; Non-residential real estate leasing; Leasing services (excluding licensed leasing services); Special equipment leasing; Electronic and mechanical equipment maintenance (excluding special equipment); Technical services, technology development, technical consultation, technical exchange, technology transfer, and technology promotion; General equipment manufacturing (excluding special equipment manufacturing); Mechanical parts and components processing; Labor services (excluding labor dispatch); Concrete structural component manufacturing; Concrete structural component sales; Engineering and technological research and experimental development.