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IPC分类查询(中英)-WIPO – 检索国际和国家专利汇编 1615

http://patentscope2.wipo.int/search/zh/search.jsf



This patent search tool allows you not only to search the PCT database of about 2 million International Applications but also the worldwide patent collections. This search facility features: flexible search syntax; automatic word stemming and relevance ranking; as well as graphical results.

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