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Chongqing Gold Mechanical & Electrical Equipment Co., Ltd.
Beijing Topsky Century Holding Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
Qingdao Tlead International Co., Ltd.
Shandong Dongrun Instrument Science and Technology Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Hangzhou Lohand Biological Co., Ltd.
Wincom Company Ltd.
Jinan Handa Electron Technology Co., Ltd.
Shenzhen Handsome Technology Co., Ltd.
Shanghai Drawell Scientific Instrument Co., Ltd.