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Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Huazheng Electric Manufacturing (Baoding) Co., Ltd.
Wincom Company Ltd.
Qingdao Tlead International Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
Shenzhen Security Electronic Equipment Co., Ltd.
Beijing Topsky Century Holding Co., Ltd.
Shandong Dongrun Instrument Science and Technology Co., Ltd.
Jinan Handa Electron Technology Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
Shenzhen Handsome Technology Co., Ltd.
Shanghai Boqu Instrument Co., Ltd.
Xi'an Tosilon Automation Co., Ltd.
Zhuhai City Deyuan Import & Export Co., Ltd.