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Beijing GFUVE Electronics Co., Ltd.
Shenzhen Sunyuan Technology Co., Ltd.
Yueqing Haixin Electronic Science Technology Co., Ltd.
Hebei Xukang Meter Manufacturing Co., Ltd.
Xi'an Tosilon Automation Co., Ltd.
Xiuyan Precision Instrument Factory
Shenzhen Bonad Instrument Co., Ltd.
Beijing ZhongRuiZhiCheng Technology Co., Ltd.