Sales and maintenance of bearings, screws, guide rails, seals, mechanical parts, electronic components, electrical machinery and equipment, metal products, motors, robots and accessories, and industrial rubber products; sales of lubricants; design, research and development, sales, maintenance, and manufacturing of automated control system devices, energy-saving and environmentally friendly equipment, sensors, transmission mechanical components, intelligent mechanical equipment, and general mechanical equipment (manufacturing projects are operated separately by the branch); provision of technical services and technical consultation for the above products; computer information