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Hangzhou Chuankong General Equipment Co., Ltd.
Suzhou Since Gas System Co., Ltd.
Wuxi Zhongrui Air Separation Equipments Co., Ltd.
Zhejiang Yuanda Air Separation Equipment Co., Ltd.
TIANJIN PUHUI SCIENCE AND TECHNOLOGY DEVELOPMENT CO., LTD.
Wuhu Frontage Imp. and Exp. Co., Ltd.
Hokaido Vacuum Technology (Int'l) Group Limited
Beijing Sunny Young Technology Company Limited