Group 1 - Guangdong Changying Precision Technology Co., Ltd. and Dongguan Xihe Precision Technology Co., Ltd. applied for a patent titled "Electronic Device Shell and Its Manufacturing Method" with publication number CN120362895A, filed on April 2025 [1] - The patent describes a manufacturing method that includes creating a magnesium alloy frame and an aluminum alloy middle plate, which are joined through brazing in a vacuum environment to form a magnesium/aluminum composite [1] - The method enhances the bonding strength between the magnesium alloy frame and aluminum alloy middle plate, addressing the challenge of connecting dissimilar metals [1] Group 2 - Guangdong Changying Precision Technology Co., Ltd. was established in 2010, located in Dongguan, primarily engaged in the manufacturing of computers, communications, and other electronic devices, with a registered capital of 600 million RMB [1] - The company has invested in 5 enterprises, participated in 38 bidding projects, holds 1,114 patent records, and possesses 225 administrative licenses [1] - Dongguan Xihe Precision Technology Co., Ltd. was founded in 2020, also located in Dongguan, focusing on similar manufacturing activities, with a registered capital of 30 million RMB [2] - The company has participated in 7 bidding projects, holds 69 patent records, and has 13 administrative licenses [2]