Sales of machinery and equipment; Research and development of machinery and equipment; Manufacturing of specialized equipment; General machinery installation services; Repair of specialized equipment; Manufacturing of equipment for environmental protection; Sales of equipment for environmental protection; Manufacturing of metalworking machinery; Manufacturing of electrical machinery for specialized use; Technical services, technical development, technical consultation, technical exchange, technology transfer, technology promotion; Wholesale of hardware products; Sales of metal products; Sales of electronic products; Sales of office equipment; Sales of office supplies; Software development; Information system integration services; Computer system services