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