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Qingdao Tlead International Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
Beijing Topsky Century Holding Co., Ltd.
Dongguan Haida Equipment Co., Ltd.
Huazheng Electric Manufacturing (Baoding) Co., Ltd.
Xi'an Heb Biotechnology Co., Ltd.
Shanghai Drawell Scientific Instrument Co., Ltd.
Liaoning Huake Petroleum Apparatus Science & Technology Co., Ltd.
Jinan Handa Electron Technology Co., Ltd.
Shenzhen Handsome Technology Co., Ltd.
Shandong Dongrun Instrument Science and Technology Co., Ltd.
Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Fuzhou DIT Industry & Trade Co., Ltd.
Wincom Company Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
Labmen Instrument Limited