对《国际专利分类表》第七版一些变化的研究
2002-05-30分类号：G254.1
【部门】南开大学图书馆 南开大学图书馆 天津300071 天津300071
【摘要】The paper introduces the changes of the 7 th edition of International Patent Classification,including the number of classification entries,the number of indexing code entries and its basic structure.The relations of its changes to human technical inventions are also discussed.
【关键词】patent classification table development research/IPC
【基金】
【所属期刊栏目】情报理论与实践
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