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Beijing Topsky Century Holding Co., Ltd.
Jinan Handa Electron Technology Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
Qingdao Tlead International Co., Ltd.
Huazheng Electric Manufacturing (Baoding) Co., Ltd.
Shenzhen Handsome Technology Co., Ltd.
Labmen Instrument Limited
Liaoning Huake Petroleum Apparatus Science & Technology Co., Ltd.
Zhejiang Scientific Instruments & Materials Import & Export Co., Ltd.