Group 1 - The State Intellectual Property Office of China granted a patent for a "Distributed Differential Protection Device" to China Mobile Communications Group Hebei Co., Ltd. and China Mobile Communications Group Co., Ltd. The patent was announced with the authorization number CN222814225U and the application date was March 2024 [1] - The patent describes a utility model related to differential protection device technology, which includes a differential protection module, an installation housing, and a drying component. The installation housing has a chamber suitable for the installation of the differential protection module, and at least one side wall of the chamber is equipped with a drying component that communicates with the chamber to ensure proper functioning even in humid environments, thereby enhancing usability and lifespan [1] - China Mobile Communications Group Hebei Co., Ltd. was established in 2001 and is based in Shijiazhuang. The company primarily engages in telecommunications, broadcasting, and satellite transmission services, with a registered capital of 431466.87 million RMB. It has made one external investment, participated in 5000 bidding projects, and holds 14 trademark records and 335 patent records [1] Group 2 - China Mobile Communications Group Co., Ltd. was founded in 1999 and is located in Beijing. The company focuses on telecommunications, broadcasting, and satellite transmission services, with a registered capital of 30000000 million RMB. It has made 52 external investments, participated in 5000 bidding projects, and holds 2179 trademark records and 5000 patent records [2]