Research and development of mechanical equipment; manufacturing of plastic processing specialized equipment; sales of plastic processing specialized equipment; manufacturing of hardware products; retail of hardware products; sales of automobiles; manufacturing of seals; sales of seals; manufacturing of metal structures; sales of metal structures; metal cutting processing services; manufacturing of high-speed rail equipment and accessories; sales of high-speed rail equipment and accessories; sales of Class I medical devices; manufacturing of specialized equipment (excluding licensed specialized equipment); engineering management services; engineering and technological research and experimental development; manufacturing of security equipment; sales of security equipment; industrial engineering design services; metal door and window engineering construction; manufacturing of doors and windows; sales of doors and windows; manufacturing of bearings, gears, and transmission components; sales of bearings, gears, and transmission components; sales of refrigeration and air conditioning equipment; import and export of technology; import and export of goods; internet sales (excluding goods requiring sales permits). Licensed items: production of road motor vehicles; interior decoration.