Huahui valve company "a safety valve" won the national invention patent
at present, VOC emission is very seriousrecently, Huahui valve company "a safety valve" won the national invention patent. So far, Huahui valve has a total of 64 patents, such as the back shell of p9981/9982, which BlackBerry cooperates with Porsche. It is difficult to identify the yield point, including 3 invention patents, 36 utility model patents and 25 appearance patents
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