Manufacture of fasteners; Sales of fasteners; Manufacture of metal chains and other metal products; Sales of metal chains and other metal products; Manufacture of power facility equipment; Sales of power facility equipment; Manufacture of railway locomotive and rolling stock parts; Sales of railway locomotive and rolling stock parts; Manufacture of mining machinery; Sales of mining machinery; Manufacture of building metal fittings; Sales of building metal fittings; Manufacture of photovoltaic equipment and components; Sales of photovoltaic equipment and components; Manufacture of metal structures; Sales of metal structures; Manufacture of concrete structural components; Sales of concrete structural components; Manufacture of automotive parts and accessories; Sales of high-quality special steel materials; Retail of hardware products; Sales of labor protection products; Sales of mechanical equipment; Sales of pneumatic and electric tools; Sales of molds; Sales of valves and cocks; Recycling of renewable resources (excluding production scrap metals); Import and export of goods; Import and export of technologies