Group 1 - Harbin Dong'an Automobile Engine Manufacturing Co., Ltd. and Harbin Dong'an Automobile Power Co., Ltd. have applied for a patent for a "cylinder head with a double-layer material valve seat ring" [1] - The patent aims to enhance the wear resistance of the valve seat ring while reducing production costs by using a low-cost iron-based material for the support part [1] - The structure of the valve seat rings includes a support part for valve installation and a working part for valve sealing, both formed as a single unit [1] Group 2 - Harbin Dong'an Automobile Engine Manufacturing Co., Ltd. was established in 1998 with a registered capital of 500 million RMB and has participated in 3,501 bidding projects [2] - Harbin Dong'an Automobile Power Co., Ltd. also established in 1998 has a registered capital of approximately 475.78 million RMB and has invested in 5 companies [2] - The engine manufacturing company holds 858 patents and the power company holds 1,091 patents, indicating a strong focus on innovation and intellectual property [2]