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Shanghai Drawell Scientific Instrument Co., Ltd.
Beijing Topsky Century Holding Co., Ltd.
Q-Ying Plastic & Electronic (Shenzhen) Co., Ltd.
Jinan Handa Electron Technology Co., Ltd.
Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
HV Hipot Electric Co., Ltd.
Shanghai Boqu Instrument Co., Ltd.
Shenzhen Security Electronic Equipment Co., Ltd.