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