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PDF(2200 KB)
PDF(2200 KB)
中国三种类型专利密度分布时空差异研究
({{custom_author.role_cn}}), {{javascript:window.custom_author_cn_index++;}}Three Types of Patent Density Distribution Variance Analysis on Provincial Level in China
({{custom_author.role_en}}), {{javascript:window.custom_author_en_index++;}}专利;实用新型;外观设计;专利密度
Patent for Invention;Utility Model;Appearance Design;Patent Density
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