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Beijing Topsky Century Holding Co., Ltd.
Zhengzhou Nanbei Instrument Equipment Co., Ltd.
Junhong Electronic & Technology Co., Ltd.
Guangzhou DENS Technology Co., Limited
Dongguan V Finder Electronic Technology Co., Ltd.
Hunan Puqi Geologic Exploration Equipment Institute (Common Partnership)
Hangzhou Dooren Technology Co., Ltd.
Hangzhou EndoTop Medi-Tech Co., Ltd.