Technical services, technology development, technical consultation, technology exchange, technology transfer, technology promotion; Software development; Sales of industrial automatic control system devices; Sales of power facilities and equipment; Sales of power distribution switch control equipment; Software sales; Sales of electrical instruments and meters; Sales of calculator equipment; Sales of electrical machinery and equipment; Supply of instruments and meters sales; Sales of electronic components and electromechanical components; Intelligent control system integration; Artificial intelligence application software development; Information system integration services; Sales of intelligent instrumentation; Sales of electrical signal equipment and devices; Retail of computer hardware and software and auxiliary equipment; Sales of electrical equipment; Instrumentation sales; Security equipment sales; Office equipment sales; Retail of hardware products; Sales of pneumatic power machinery and components; Sales of experimental and analytical instruments; Sales of special equipment for oil refining and chemical production; Maintenance of electronic and mechanical equipment.