青山纸业：公司子公司深圳恒宝通持有恒宝通光电子（马来西亚）股份有限公司90%股权

Group 1 - The core viewpoint of the article is that Qingshan Paper Industry (600103) has confirmed its subsidiary Shenzhen Hengbao Tong holds a 90% stake in Hengbao Tong Optoelectronics (Malaysia) Co., Ltd, which focuses on the production and sales of optical module products [1] Group 2 - The subsidiary's main business is the production and sales of optical module products [1]