Manufacturing of electrical accessories; manufacturing of special electronic materials; manufacturing of special instruments for environmental monitoring; manufacturing of hardware products; repair of metal products; container maintenance; manufacturing of railway rolling stock parts; sales of metal products; manufacturing of motorcycle parts; manufacturing of special electronic equipment; sales of special electronic equipment; metal surface treatment and heat treatment processing; spraying processing; electroplating processing; general equipment manufacturing (excluding special equipment manufacturing); metal parts for construction Manufacturing; sales of metal parts for construction; processing of mechanical parts and components; sales of mechanical parts and components; manufacturing of general parts; research and development of mechanical equipment; manufacturing of industrial robots; human resources services (excluding employment agency activities and labor dispatch services); sales of second-class medical equipment; manufacturing of electrical equipment; sales of electrical equipment; retail of auto parts and accessories; manufacturing of auto parts and accessories; sales of charging piles; sales of railway rolling stock accessories