Technical services, technical development, technical consulting, technical exchange, technology transfer, and technology promotion; sales of Class II medical devices; production of protective equipment for medical staff (Class I medical devices); manufacturing of gas and liquid separation and purification equipment; sales of gas and liquid separation and purification equipment; manufacturing of pumps and vacuum equipment; sales of pumps and vacuum equipment; manufacturing of refrigeration and air conditioning equipment; sales of refrigeration and air conditioning equipment; sales of household appliances; sales of household appliance parts; manufacturing of general equipment (excluding special equipment); manufacturing of electronic components; wholesale of electronic components; retail of electronic components; sales of high-performance sealing materials; manufacturing of general valves and cocks. Licensed items: production of disinfection equipment; sales of disinfection equipment; production of Class III medical devices; operation of Class III medical devices; leasing of Class III medical devices; production of Class II medical devices; inspection and testing services.