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.
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.
出处
《情报理论与实践》
CSSCI
北大核心
2002年第3期203-206,共4页
Information Studies:Theory & Application
