8to9.net
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中国专利文献网-失效专利、专利查询、专利服务、专利技术、专利网
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- 专利,专利服务,专利发明,中国专利,失效专利,专利技术,专利信息,专利成果，Chinese Patent information, intellectual property, sipo, inventions, patents, marks, trademarks, patent searching
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中文 (Chinese)
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