Manufacturing of special equipment for rubber processing; sales of special equipment for rubber processing; manufacturing of casting machinery; sales of casting machinery; manufacturing of special equipment for environmental protection; sales of special equipment for environmental protection; sales of mechanical equipment; sales of electrical equipment; sales of mechanical and electrical equipment; sales of rubber products; sales of distribution switch control equipment; processing of mechanical parts and components; sales of mechanical parts and components; sales of metal products; retail of hardware products; repair of general equipment; repair of special equipment; repair of electrical equipment; maintenance of electronic and mechanical equipment (excluding special equipment); instrumentation Watch repair; textile special equipment manufacturing; textile special equipment sales; wood and bamboo processing machinery manufacturing; wood and bamboo processing machinery sales; auto parts and accessories manufacturing; auto parts wholesale; auto parts retail; motorcycle parts manufacturing; motorcycles and parts wholesale; motorcycles and parts retail; tire sales; wire and cable management; daily necessities sales; daily necessities wholesale; instrument sales; electronic product sales; computer software, hardware and auxiliary equipment retail; computer software, hardware and auxiliary equipment wholesale; goods import and export; technology import and export.