Manufacturing of electronic components; Manufacturing of film and television recording and playback equipment; Manufacturing of audio equipment; Sales of audio equipment; Sales of broadcasting, film and television equipment; Research and development of electronic specialized materials; Sales of optoelectronic devices; Sales of electronic components and electromechanical component equipment; Sales of electronic products; Sales of electronic specialized equipment; Sales of electronic vacuum devices; Sales of power electronic components; Sales of electronic components and electromechanical component equipment; Sales of electronic specialized materials; Sales of optoelectronic devices; Wholesale of electronic components; Sales of plastic products; Domestic trade agency; Trade brokerage; Internet sales (excluding sales of goods that require licensing); Internet device sales; Professional design services; Research and development of hardware products; Research and development of household appliances; Research and development of new material technology; Research and development of mechanical equipment; Engineering technical services (excluding planning management, survey, design, and supervision); Foreign contracted projects; Wholesale of daily necessities; Wholesale of hardware products; Wholesale of computer software, hardware, and auxiliary equipment; Import and export of goods; Technology import and export; Import and export agency