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Laizhou Weiyi Experimental Machinery Manufacture Co., Ltd.
Qingdao Tlead International Co., Ltd.
Shanghai RuiBiao Construction Machinery Co., Ltd.
Shenzhen Pride Instrument Inc.
Shenzhen Handsome Technology Co., Ltd.
Leader Precision Instrument Co., Ltd.
Shenzhen Bonad Instrument Co., Ltd.
Zhengzhou CY Scientific Instrument Co., Ltd.
Dongguan Hong Tu Instrument Co., Ltd.
Shandong China Coal Industrial & Mining Supplies Group Co., Ltd.
Yueqing Haixin Electronic Science Technology Co., Ltd.