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Hanzhong Quan Yuan Electronic Co., Ltd.
Xi'an Tosilon Automation Co., Ltd.
Hebei Xukang Meter Manufacturing Co., Ltd.
Shenzhen Sunyuan Technology Co., Ltd.
Beijing ZhongRuiZhiCheng Technology Co., Ltd.
Xiuyan Precision Instrument Factory
Shanghai Cixi Instrument Co., Ltd.
ANHUI WNK ELECTRONIC ENGINEERING CO., LTD.