Group 1 - The National Intellectual Property Administration of China has published a patent application for a method of thermal coupling modeling and analysis of refractory material masonry, filed by four companies including Yangquan Jinyu Tongda High-Temperature Materials Co., Ltd. and Beijing Jinyu Tongda Refractory Technology Co., Ltd. [1] - The patent aims to simulate the thermal shrinkage process of masonry, identifying stress concentration areas to prevent cracking and collapse of the masonry during heating [1] - The method utilizes finite element analysis software to create models that allow for free thermal expansion of the masonry, thus optimizing the production process and reducing the risk of deformation due to excessive thermal stress [1] Group 2 - Yangquan Jinyu Tongda High-Temperature Materials Co., Ltd. was established in 2009 with a registered capital of 135 million RMB and has participated in 2,130 bidding projects [2] - Beijing Jinyu Tongda Refractory Technology Co., Ltd. was founded in 2006 with a registered capital of approximately 285.17 million RMB and has 252 patents [2] - Gongyi Tongda Central Plains Refractory Technology Co., Ltd. was established in 1994 with a registered capital of 40 million RMB and has participated in 2,692 bidding projects [2] - Beijing Tongda Refractory Engineering Technology Co., Ltd. was founded in 2003 with a registered capital of 50 million RMB and has participated in 993 bidding projects [3]