Group 1 - Nanhai Submarine Cable Co., Ltd. and Zhongtian Technology Submarine Cable Co., Ltd. have applied for a patent titled "Submarine Cable Core Deairing Device" with publication number CN120015419A, filed on March 2025 [1] - The patent involves a deairing technology for submarine cables, featuring a deairing chamber, multiple wind chambers, and several return air heating components, designed to enhance the uniform heating of the cable core [1] - The deairing device creates a circulation air path that allows air to convect and exchange heat with the submarine cable core, improving the heating efficiency across various parts of the cable core [1] Group 2 - Nanhai Submarine Cable Co., Ltd. was established in 2019, located in Shanwei City, with a registered capital of 700 million RMB, and has participated in 117 bidding projects and holds 143 patents [2] - Zhongtian Technology Submarine Cable Co., Ltd. was founded in 2004, based in Nantong City, with a registered capital of 1.76 billion RMB, having participated in 5,000 bidding projects and holds 543 patents [2]