Instrument and meter manufacturing; instrument and meter sales; other general instrument manufacturing; industrial automatic control system device manufacturing; industrial automatic control system device sales; intelligent instrument and meter manufacturing; intelligent instrument and meter sales; electrical instrument and meter manufacturing; electrical instrument and meter sales; supply instrument and meter manufacturing; supply instrument and meter sales; electronic measuring instrument manufacturing; electronic measuring instrument sales; special instrument manufacturing; railway locomotive and rolling stock accessories manufacturing; railway locomotive and rolling stock accessories sales; high-speed railway equipment and accessories manufacturing; high-speed railway equipment and accessories sales; urban rail transit equipment manufacturing; rail transit special equipment, key systems and components sales; electronic component manufacturing; electronic component retail; IoT equipment manufacturing; IoT equipment sales; electrical signal equipment device manufacturing; electrical signal equipment device sales; instrument and meter repair; first-class medical device production; first-class medical device sales; second-class medical device sales; gas and liquid separation and purification equipment manufacturing; gas and liquid separation and purification equipment sales; goods import and export; technical services, technical development, technical consulting, technical exchange, technology transfer, technology promotion; leasing services (excluding licensed leasing services). Licensed items: second-class medical device production.