Mechanical parts and component processing; Sales of mechanical parts and components; Research and development of mechanical equipment; Sales of mechanical equipment; Manufacturing of bearings, gears, and transmission components; Sales of bearings, gears, and transmission components; General equipment manufacturing (excluding special equipment manufacturing); Manufacturing of general components; Hardware product manufacturing; Wholesale of hardware products; Mold manufacturing; Mold sales; Maintenance of electronic and mechanical equipment (excluding special equipment); Sales of metal products; Sales of metal materials; Industrial design services; Sales of office supplies; Sales of labor protection equipment; Import and export of goods; Technology import and export (except for projects that require approval in accordance with the law, business activities shall be carried out independently with the business license in accordance with the law)