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Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Laizhou Weiyi Experimental Machinery Manufacture Co., Ltd.
Shenzhen Bonad Instrument Co., Ltd.
Nanjing T-Bota Scietech Instruments & Equipment Co., Ltd.
Qingdao Tlead International Co., Ltd.
Leader Precision Instrument Co., Ltd.
Piezohannas Tech (Wuhan) Co., Limited
Shenzhen Pride Instrument Inc.
Yueqing Haixin Electronic Science Technology Co., Ltd.
Guangdong Hongsheng Testing Equipment Co., Ltd.
Dongguan Hong Tu Instrument Co., Ltd.
Shanghai RuiBiao Construction Machinery Co., Ltd.