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Beijing Topsky Century Holding Co., Ltd.
Hangzhou Dooren Technology Co., Ltd.
Junhong Electronic & Technology Co., Ltd.
Zhengzhou Nanbei Instrument Equipment Co., Ltd.
Zhengzhou HG Abrasive Tech.Co.,Ltd
Zhuozhou Tianpeng Imp. & Exp. Trade Co., Ltd.
Hunan Puqi Geologic Exploration Equipment Institute (Common Partnership)
Hongkong Joint Stars Group Limited
Zhongke-Lian Sheng (Shenzhen) Technology Co., Ltd.