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Laizhou Weiyi Experimental Machinery Manufacture Co., Ltd.
Qingdao Tlead International Co., Ltd.
Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Shenzhen Bonad Instrument Co., Ltd.
Leader Precision Instrument Co., Ltd.
Zhengzhou Nanbei Instrument Equipment Co., Ltd.
Shanghai RuiBiao Construction Machinery Co., Ltd.
Sino Age Development Technology
Nanjing T-Bota Scietech Instruments & Equipment Co., Ltd.
Shenzhen Pride Instrument Inc.
Guangdong Hongsheng Testing Equipment Co., Ltd.
Shanghai HongWei Construction Machinery Co., Ltd.
Guangzhou Haike Outdoor Sport Co., Ltd.
Yueqing Haixin Electronic Science Technology Co., Ltd.