Workers of Taiyuan Iron and Steel (Group), or TISCO, operate steel rolling equipment in Taiyuan, north China's Shanxi Province, May 24, 2019. As a leading stainless steel maker, TISCO boasted research and development of high-tech stainless steel products by large efforts on innovation. So far TISCO possesses over 2,700 authorized patents, including 772 patents for invention. (Xinhua/Cao Yang)
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