Manufacturing of communication equipment; sales of communication equipment; manufacturing of mobile communication equipment; sales of mobile communication equipment; manufacturing of power transmission and distribution and control equipment; sales of intelligent power transmission and distribution and control equipment; manufacturing of power facility equipment; sales of power facility equipment; technical services, technology development, technical consultation, technology exchange, technology transfer, technology promotion; engineering management services; leasing services (excluding licensed leasing services); leasing of non-residential real estate; manufacturing of metal structures; sales of metal structures; metal surface treatment and heat treatment processing; manufacturing of lighting fixtures; manufacturing of mechanical and electrical equipment; sales of mechanical equipment; sales of mechanical and electrical equipment; import and export of goods; sales of metal materials; information system integration services; professional repair of communication transmission equipment; sales of automobiles. Licensed items: construction engineering survey; construction engineering design; construction engineering construction; installation, maintenance and testing of power transmission, supply and reception facilities; specialized construction operations; road freight transport (excluding dangerous goods); electrical installation services; manufacturing of road motor vehicles; catering services.