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