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Shanghai HongWei Construction Machinery Co., Ltd.
Nanjing T-Bota Scietech Instruments & Equipment Co., Ltd.
Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Shenzhen Bonad Instrument Co., Ltd.
Qingdao Tlead International Co., Ltd.
Laizhou Weiyi Experimental Machinery Manufacture Co., Ltd.
Shenzhen Pride Instrument Inc.
Shenzhen Handsome Technology Co., Ltd.
Sino Age Development Technology
Leader Precision Instrument Co., Ltd.
Dongguan City Gaoxin Testing Equipment Co., Ltd.
Bestone Industrial Limited