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