Group 1 - The State Intellectual Property Office of China has published a patent application by Dalian Engineering Technology Co., Ltd. and China First Heavy Industries Co., Ltd. for a "Steel Strip Surface Blowing Device" with publication number CN120479956A, filed on June 2025 [1] - The patent describes a device that includes a fixed frame, upper and lower air knife components, and air supply pipes, designed to blow clean steel strips passing through the device [1] Group 2 - Dalian Engineering Technology Co., Ltd. was established in 1995, located in Dalian, with a registered capital of 35 million RMB, and has invested in 3 companies, participated in 3,442 bidding projects, and holds 1,085 patents [2] - China First Heavy Industries Co., Ltd. was founded in 2008, located in Qiqihar, with a registered capital of approximately 685.78 million RMB, has invested in 32 companies, participated in 3,430 bidding projects, and holds 2,088 patents [2]