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