Tiebang yam is originally a farm variety and has been recorded as early as in the "Agricultural Science Series" and "Wen County Chronicles". Later, Wenxian Nongke Seed Co., Ltd. applied to the State Trademark Office to register the trademark "顡stick" with text and graphics on March 4, 2002. The registration was approved on March 14, 2003, and the product was approved to be Class 31 "Yam ( Raw)", the registration certificate number is 3103954. Jiaozuo Weikang Industrial Co., Ltd. (hereinafter referred to as Weikang Company) applied to the State Trademark Office to register the word trademark "Iron Bar" on March 28, 2002. At this point, the trademark "Iron Bar" began to be protected by the trademark law and became Weikang Waiting for approval from several companies. Fortunately, since the 2008 Wen County Tiegun Yam Professional Cooperative sued Jia Weiwei for infringement of registered trademark rights, these companies have not restricted the local use of the name Tiegun Yam in order to support local economic development. "Tiegun" brand yam and Tiegun yam each sell their own products and live in peace. After all, they are all the same thing. They have been called iron stick yam for more than a hundred years since the Qing Dynasty. The common people have been calling it this way, and no one can control it.