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