Research and development of mechanical equipment; sales of mechanical equipment; manufacture of general equipment (excluding special equipment); manufacture of specialized equipment (excluding licensed specialized equipment); manufacture of plastic processing专用 equipment; sales of plastic processing专用 equipment; mold manufacturing; mold sales; processing of mechanical parts and components; sales of mechanical parts and components; sales of electronic products; manufacture of electronic components; manufacture of automotive parts and accessories; retail of automotive parts; manufacture of synthetic materials (excluding hazardous chemicals); technical services, technical development, technical consulting, technical exchange, technology transfer, and technology promotion; road freight transport of general cargo vehicles with a total mass of 4.5 tons or less (excluding online freight and dangerous goods); sales of specialized chemical products (excluding hazardous chemicals).