Group 1 - The State Intellectual Property Office of China has granted a patent for a "Safety Assurance System, Method, and Transfer Device for Hydrogen Storage Reservoirs" to three companies: China Petroleum Engineering Construction Co., Ltd., China Petroleum Group Engineering Co., Ltd., and China National Petroleum Corporation [1] - China Petroleum Engineering Construction Co., Ltd. was established in 1981, located in Beijing, with a registered capital of 2,409.562 million RMB. The company has invested in 12 enterprises, participated in 5,000 bidding projects, holds 10 trademark records, and has 1,148 patents [1] - China Petroleum Group Engineering Co., Ltd. was founded in 1999, located in Karamay, with a registered capital of 5,583.147471 million RMB. The company has invested in 6 enterprises, participated in 318 bidding projects, holds 260 patents, and has 13 administrative licenses [1] Group 2 - China National Petroleum Corporation was established in 1990, located in Beijing, with a registered capital of 48,690 million RMB. The company has invested in 107 enterprises, participated in 5,000 bidding projects, holds 1,441 trademark records, and has 5,000 patents [2] - The company also possesses 28 administrative licenses [2]