Core Viewpoint - Changhai Co., Ltd. confirmed that Changzhou Tianma Group Co., Ltd. is a wholly-owned subsidiary, specializing in high-performance fiberglass and related products, which extends the company's main business chain [2] Group 1 - Changzhou Tianma Group produces unsaturated polyester resins and auxiliary materials, fiberglass adhesives, and composite materials [2] - The subsidiary plays a crucial role in the company's core business operations [2]