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