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Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
Huazheng Electric Manufacturing (Baoding) Co., Ltd.
Beijing Topsky Century Holding Co., Ltd.
HV Hipot Electric Co., Ltd.
Shanghai Drawell Scientific Instrument Co., Ltd.
Hangzhou Lohand Biological Co., Ltd.
Liaoning Huake Petroleum Apparatus Science & Technology Co., Ltd.
Shenzhen Security Electronic Equipment Co., Ltd.
Jinan Handa Electron Technology Co., Ltd.