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    Ningbo Zhengmao Electronics Co.,Ltd.is located in the south of Ningbo Zhejiang Province, China,with convenient transportation.Our company specializes in researching and developing,manufacturing and saling the Switching Spark Gaps,Gas Discharge Tube and surge arresters. The company covers an area of more than 6,000 square meters, with advanced,excellent and top-tech facilities and testing equipments. 

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