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