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Tianjin Grewin Technology Co., Ltd.
Yi Wu Lv Yun Co., Ltd.
Beijing GFUVE Electronics Co., Ltd.
Shenzhen Slinya Electronic Co., Ltd.
Shanghai Boqu Instrument Co., Ltd.
Xiamen Goldenbridge Imp. & Exp. Co., Ltd.
Nanjing Kehua Instrument & Meter Co., Ltd.
Hunan Puqi Geologic Exploration Equipment Institute (Common Partnership)