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Fuzhou DIT Industry & Trade Co., Ltd.
Huazheng Electric Manufacturing (Baoding) Co., Ltd.
Shandong Dongrun Instrument Science and Technology Co., Ltd.
Beijing Topsky Century Holding Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
Shanghai Boqu Instrument Co., Ltd.
Labmen Instrument Limited
Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Qingdao Tlead International Co., Ltd.
Hangzhou Lohand Biological Co., Ltd.
Shenzhen Security Electronic Equipment Co., Ltd.