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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.
Guangzhou Haike Outdoor Sport Co., Ltd.
Bestone Industrial Limited
Yueqing Haixin Electronic Science Technology Co., Ltd.
Piezohannas Tech (Wuhan) Co., Limited
Shanghai RuiBiao Construction Machinery Co., Ltd.
Shenzhen Handsome Technology Co., Ltd.
Zhengzhou CY Scientific Instrument Co., Ltd.
Leader Precision Instrument Co., Ltd.
Shenzhen Bonad Instrument Co., Ltd.