天通股份：公司的蓝宝石晶体材料做3D封装的载盘，当前已完成产品开发并送样且已有小批量生产线

Group 1 - The company TianTong Co., Ltd. has completed product development for its sapphire crystal materials used in 3D packaging and has sent samples for testing [2] - The company has established a small-scale production line for its sapphire 3D packaging technology, which is primarily applied in 3D stacked packaging, temporary bonding carriers, and advanced GaN power devices [2] - The company is currently in the process of validating its technology and has not specified a completion date for this validation [2]