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Shanghai Drawell Scientific Instrument Co., Ltd.
Guangzhou Rongzhiyou Medical & Technology Co., Ltd.
Fujian East Promotions Co., Ltd.
Shenzhen YND Electronic Technology Co., Ltd.
Shenzhen Bonad Instrument Co., Ltd.
Shanghai Xinyi Education Technology Co., Ltd.
Qingdao Tlead International Co., Ltd.
Hangzhou Mu Yu Er Tools Co., Ltd.
Bettering International (HK) Co., Limited
Guangdong Hongsheng Testing Equipment Co., Ltd.
Beijing Topmachines S&T Co., Ltd.