Group 1 - The core viewpoint of the article is that Foster (603806) is actively engaging with investors regarding its business operations in the PCB sector [1] - The full name of the company is Hangzhou Foster Materials Co., Ltd., which operates primarily through its subsidiary, Hangzhou Foster Electronic Materials Co., Ltd. [1] - In the PCB field, the company offers products such as photosensitive dry film, flexible copper-clad laminates, and photosensitive cover film [1]

Group 1 - The core viewpoint of the article is that Foster (603806.SH) confirmed that Hangzhou Foster Applied Materials Co., Ltd. is its full name and that its PCB business is primarily conducted by its subsidiary, Hangzhou Foster Electronic Materials Co., Ltd. [2] - In the PCB sector, the company offers products such as photosensitive dry film, flexible copper-clad laminates, and photosensitive cover film [2]