Manufacturing of metal signs for traffic and public administration; manufacturing of traffic safety, control, and similar special equipment; manufacturing of urban rail transit equipment; manufacturing of coatings (excluding monitoring chemicals and hazardous chemicals); manufacturing of non-highway leisure vehicles and parts; manufacturing of special machinery with independent functions; manufacturing of asphalt products for construction; manufacturing of construction engineering machinery; manufacturing of specialized production vehicles; manufacturing of other metal processing machinery; processing of mechanical parts; engineering services for urban rail transit facilities; design services for metal structural parts; provision of construction equipment services; mechanical technology development services; bidding agency services for engineering construction projects; installation of various traffic signal lights and systems; construction of traffic signs; leasing of mechanical equipment; repair of general equipment; repair of specialized equipment; sales of general mechanical equipment; sales of specialized equipment; sales of electrical mechanical equipment; sales of asphalt and its products; sales of products manufactured by the company (excluding those prohibited by national laws and regulations; products involving licenses must obtain licenses before sale); wholesale of coatings; wholesale of mechanical parts; retail of coatings; retail of general mechanical equipment; retail of mechanical parts; trade agency; import and export of goods (excluding goods under exclusive franchise or control); import and export of technology.