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TANCY INSTRUMENT GROUP CO., LTD.BEIJING DATA FOUNTAIN SOFTWARE DEVELOPMENT CO., LTD.ESLINK CLOUD COMPUTING (HANGZHOU) CO., LTD.ZHEJIANG TANCY ULTRASONIC TECHNOLOGY CO., LTD.GUANGZHOU JINRAN SMART GAS METER CO., LTD.Chongqing Hezhong Huilian Technology Co., Ltd.Zhejiang Tancy inotech Test Technology Co., Ltd.