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Zhuhai City Deyuan Import & Export Co., Ltd.
Huazheng Electric Manufacturing (Baoding) Co., Ltd.
Nanjing Kejie Analytical Instrument Co., Ltd.
Shanghai Boqu Instrument Co., Ltd.
Liaoning Huake Petroleum Apparatus Science & Technology Co., Ltd.
HV Hipot Electric Co., Ltd.
Shenzhen Security Electronic Equipment Co., Ltd.