Group 1 - China Coal Technology and Engineering Group Mining Research Institute Co., Ltd. obtained a patent for "Method and Device for Determining the Impact Tendency of Coal Rock Samples Based on Size Effect," with authorization announcement number CN116660023B, applied on April 2023 [1] - The company was established in 2020, located in Beijing, and primarily engages in research and experimental development, with a registered capital of 200 million RMB [1] - The company has invested in 4 enterprises, participated in 1,041 bidding projects, and holds 1,881 patent records, along with 10 administrative licenses [1] Group 2 - China Coal Science Research Institute, established in 2000 and located in Beijing, also focuses on research and experimental development, with a registered capital of approximately 1,006.8 million RMB [1] - This institute has invested in 23 enterprises, participated in 760 bidding projects, and has 23 trademark records and 1,448 patent records, in addition to 46 administrative licenses [1] Group 3 - Tiandi Technology Co., Ltd., founded in 2000 and based in Beijing, primarily engages in technology promotion and application services, with a registered capital of approximately 4,138.6 million RMB [2] - The company has invested in 30 enterprises, participated in 2,066 bidding projects, and holds 29 trademark records and 1,953 patent records, along with 23 administrative licenses [2]