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