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The First Twenty-Five Years of the International Patent Classification 1971-1996
World Intellectual Property Organization
出版WIPO, 1996
ISBN92805062509789280506259
URLhttp://books.google.com.hk/books?id=e63bRLHEJPwC&hl=&source=gbs_api
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註釋This publication is intended to commemorate the achievements in the field of the IPC during its first 25 years.