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Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Laizhou Weiyi Experimental Machinery Manufacture Co., Ltd.
Nanjing T-Bota Scietech Instruments & Equipment Co., Ltd.
Yueqing Haixin Electronic Science Technology Co., Ltd.
Shenzhen Dacen Digital Technology Co.,Ltd
Shanghai RuiBiao Construction Machinery Co., Ltd.
Leader Precision Instrument Co., Ltd.
Dongguan City Gaoxin Testing Equipment Co., Ltd.
Shenzhen Pride Instrument Inc.
Shenzhen Bonad Instrument Co., Ltd.