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Leader Precision Instrument Co., Ltd.
Qingdao Tlead International Co., Ltd.
Nanjing T-Bota Scietech Instruments & Equipment Co., Ltd.
Guangdong Hongsheng Testing Equipment Co., Ltd.
Zhengzhou CY Scientific Instrument Co., Ltd.
Shenzhen Handsome Technology Co., Ltd.
Laizhou Weiyi Experimental Machinery Manufacture Co., Ltd.
Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Wuxi JinyiBo Instrument Technology Co., Ltd.
Zhengzhou Nanbei Instrument Equipment Co., Ltd.
Sino Age Development Technology