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