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Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Nanjing T-Bota Scietech Instruments & Equipment Co., Ltd.
Shanghai RuiBiao Construction Machinery Co., Ltd.
Shenzhen Bonad Instrument Co., Ltd.
Piezohannas Tech (Wuhan) Co., Limited
Laizhou Weiyi Experimental Machinery Manufacture Co., Ltd.
Leader Precision Instrument Co., Ltd.
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Zhengzhou CY Scientific Instrument Co., Ltd.
Qingdao Tlead International Co., Ltd.