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