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Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Qingdao Tlead International Co., Ltd.
Zhuhai City Deyuan Import & Export Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
Jinan Handa Electron Technology Co., Ltd.
Shandong Dongrun Instrument Science and Technology Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
WANT Balance Instrument Co., Ltd.
Beijing Topsky Century Holding Co., Ltd.
Huazheng Electric Manufacturing (Baoding) Co., Ltd.
Liaoning Huake Petroleum Apparatus Science & Technology Co., Ltd.
Shenzhen Security Electronic Equipment Co., Ltd.