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Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Huazheng Electric Manufacturing (Baoding) Co., Ltd.
Jinan Handa Electron Technology Co., Ltd.
Shanghai Drawell Scientific Instrument Co., Ltd.
Liaoning Huake Petroleum Apparatus Science & Technology Co., Ltd.
Wincom Company Ltd.
HV Hipot Electric Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
Xi'an Tosilon Automation Co., Ltd.
Nengshi Analytical Sensor Co., Ltd.
Zhuhai City Deyuan Import & Export Co., Ltd.
Q-Ying Plastic & Electronic (Shenzhen) Co., Ltd.