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