R&D of household appliances; manufacturing of household appliances; sales of household appliances; sales of household appliances spare parts; household appliance installation services; mold manufacturing; mold sales; refrigeration and air conditioning equipment manufacturing; refrigeration and air conditioning equipment sales; daily household appliances retail; household appliances manufacturing; household appliances sales; electronic product sales; machinery and equipment sales; technical services, technology development, technical consultation, technology exchange, technology transfer, technology promotion; technology import and export; goods import and export; customs clearance business