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