Manufacture of general parts; machining of mechanical parts and components; sales of mechanical parts and components; manufacture of railway locomotive and rolling stock parts; sales of railway locomotive and rolling stock parts; manufacture of seals; sales of seals; manufacture of metal tools; sales of metal tools; manufacture of plastic products; sales of plastic products; manufacture of rubber products; sales of rubber products; manufacture of fasteners; sales of fasteners; manufacture of hardware products; wholesale of hardware products; retail of hardware products; manufacture of synthetic materials (excluding hazardous chemicals); sales of synthetic materials; sales of rail transit engineering machinery and parts.