Electrical machinery specialized equipment manufacturing; electronic specialized equipment manufacturing; transformer, rectifier and inductor manufacturing; electric motor manufacturing; power electronic component manufacturing; import and export of goods; generator and generator set manufacturing; photovoltaic equipment and component manufacturing; electrical accessory manufacturing; electrical accessory sales; electrical equipment sales; lighting fixture manufacturing; mechanical and electrical equipment manufacturing; metal product repair; general equipment repair; specialized equipment repair; electrical equipment repair; instrument and meter repair; communication transmission equipment professional repair; communication switching equipment professional repair; communication equipment repair; industrial automatic control system device manufacturing; electrical instrument and meter manufacturing; testing machine manufacturing; transportation equipment and production counting instrument manufacturing; teaching specialized instrument manufacturing; electronic measuring instrument manufacturing; railway-specific measuring or testing instrument manufacturing; ship automation, detection and monitoring system manufacturing; clock and timing instrument manufacturing; railway rolling stock parts manufacturing; urban rail transit equipment manufacturing; marine supporting equipment manufacturing; lubricating oil sales; electrical signal equipment device manufacturing; power facility equipment manufacturing; electrical mechanical equipment sales; photovoltaic equipment and component sales; security system monitoring services; battery parts sales; battery parts production; battery sales; railway rolling stock sales; rail transit engineering machinery and parts sales; technology import and export; labor services (excluding labor dispatch); technical services, technical development, technical consulting, technical exchange, technology transfer, technology promotion; power transmission and distribution and control equipment manufacturing; instrument and meter manufacturing; intelligent instrument and meter manufacturing; energy storage technical services; high-speed rail equipment and parts manufacturing; rail transit specialized equipment, key systems and parts sales; ordinary mechanical equipment installation services; electrical installation services; import and export agency.