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Beijing Topsky Century Holding Co., Ltd.
Qingdao Tlead International Co., Ltd.
Huazheng Electric Manufacturing (Baoding) Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
Shandong Dongrun Instrument Science and Technology Co., Ltd.
Liaoning Huake Petroleum Apparatus Science & Technology Co., Ltd.
Jinan Handa Electron Technology Co., Ltd.
Xi'an Heb Biotechnology Co., Ltd.
Zhuhai City Deyuan Import & Export Co., Ltd.
Q-Ying Plastic & Electronic (Shenzhen) Co., Ltd.