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Beijing Topmachines S&T Co., Ltd.
Shandong Dongrun Instrument Science and Technology Co., Ltd.
Canfort Laboratory and Education Supplies Co., Ltd.
Fujian East Promotions Co., Ltd.
Ningbo Hongbo Optical Instrument Co., Ltd.
Shenzhen Siyuan Digital Technology Co., Ltd.
Tianjin Humanda Technology Development Co., Ltd.
Hangzhou Dooren Technology Co., Ltd.
Beijing Topsky Century Holding Co., Ltd.
Huanghua Faithful Instrument Co., Ltd.