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Shandong Dongrun Instrument Science and Technology Co., Ltd.
Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Qingdao Tlead International Co., Ltd.
Shanghai Drawell Scientific Instrument Co., Ltd.
Fuzhou DIT Industry & Trade Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
Beijing Topsky Century Holding Co., Ltd.
Huazheng Electric Manufacturing (Baoding) Co., Ltd.
Changzhou Andwin International Corporation Limited
WANT Balance Instrument Co., Ltd.
Jinan Handa Electron Technology Co., Ltd.
Shenzhen Security Electronic Equipment Co., Ltd.
TRYTE TECHNOLOGY (HUNAN) DEVELOPMENT CO., LTD.