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Wincom Company Ltd.
Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Huazheng Electric Manufacturing (Baoding) Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
Dongguan Haida Equipment Co., Ltd.
Beijing Topsky Century Holding Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
Qingdao Tlead International Co., Ltd.
Jinan Handa Electron Technology Co., Ltd.
Shanghai Drawell Scientific Instrument Co., Ltd.
Shandong Dongrun Instrument Science and Technology Co., Ltd.