Instrument and meter manufacturing; Intelligent instrument and meter manufacturing; Electrical instrument and meter manufacturing; Electronic component manufacturing; Power electronic component manufacturing; Electronic measuring instrument manufacturing; Power facility equipment manufacturing; High-speed rail equipment and parts manufacturing; Experimental analysis instrument manufacturing; Industrial automatic control system device manufacturing; General equipment manufacturing (excluding special equipment manufacturing); Other general instrument manufacturing; Instrument and meter repair; Electrical equipment repair; Instrument and meter sales; Intelligent instrument and meter sales; Electrical instrument and meter sales; Electronic component retail; Electronic component wholesale; Power electronic component sales; Communication equipment sales; Power facility equipment sales; Electrical equipment sales; Electronic product sales; Rail transit special equipment, key systems, and parts sales; Railway locomotive vehicle parts sales; High-speed rail equipment and parts sales; Electrical signal equipment device sales; Power distribution switchgear equipment sales; Industrial automatic control system device sales; Integrated circuit sales; Semiconductor discrete device sales; Intelligent control system integration; Software development; Internet of Things technical services; Sales agency; Domestic trade agency; Import and export of goods; Technology import and export; Technical services, technology development, technical consultation, technical exchange, technology transfer, and technology promotion.