Manufacturing of electronic specialty materials; manufacturing of display devices; manufacturing of other electronic devices; sales of display devices; wholesale of electronic components; research and development of mechanical equipment; wholesale of computer software and hardware and auxiliary equipment; retail of computer software and hardware and auxiliary equipment; sales of electronic specialty materials; manufacturing of broadcasting and television equipment (excluding broadcasting and television transmission equipment); sales of lighting fixtures; sales of communication equipment; sales of audio equipment; sales of metal products; repair of computers and office equipment; system integration services; import and export of goods; import and export of technology; development of artificial intelligence application software; road freight transportation of general cargo vehicles with a total mass of 4.5 tons or less (excluding network freight and hazardous goods).