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Qingdao Tlead International Co., Ltd.
Zhuhai City Deyuan Import & Export Co., Ltd.
Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
Liaoning Huake Petroleum Apparatus Science & Technology Co., Ltd.
Shanghai Drawell Scientific Instrument Co., Ltd.
Huazheng Electric Manufacturing (Baoding) Co., Ltd.
WANT Balance Instrument Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
Beijing Topsky Century Holding Co., Ltd.
Jinan Handa Electron Technology Co., Ltd.
Hangzhou Lohand Biological Co., Ltd.
Chongqing Gold Mechanical & Electrical Equipment Co., Ltd.
Fuzhou DIT Industry & Trade Co., Ltd.
Labmen Instrument Limited