Production and sales of mechanical accessories, dust removal equipment and accessories, automobile molds, measuring tools, photovoltaic brackets, special tools, special measuring instruments; production, processing and sales of complete sets of welding production line equipment, automated production line accessories and tooling, heavy industry machinery equipment and accessories; sales of machine tool accessories and castings** (Projects subject to approval in accordance with the law can only carry out business activities with the approval of relevant departments; general business projects can independently carry out business activities in accordance with the law)