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