Group 1 - The State Intellectual Property Office of China has granted a patent for "Leak Detection Method, Detection Device, and Electronic Equipment for Hydraulic Systems" to Dalian Engineering Technology Co., Ltd. and China First Heavy Industries [1] - Dalian Engineering Technology Co., Ltd. was established in 1995, located in Dalian, with a registered capital of 350 million RMB, and has participated in 3,605 bidding projects and holds 1,132 patents [1] - China First Heavy Industries Co., Ltd. was founded in 2008, located in Qiqihar, with a registered capital of approximately 6.86 billion RMB, and has participated in 3,908 bidding projects and holds 2,227 patents [1] Group 2 - Dalian Engineering Technology Co., Ltd. has made investments in 3 companies and holds 17 administrative licenses [1] - China First Heavy Industries Co., Ltd. has invested in 33 companies and holds 344 administrative licenses [1]