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