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