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