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