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1.	Strasbourg agreement concerning the international patent classification of March 24, 1971, as amended on September 28, 1979. World Intellectual Property Organization Geneva : World Intellectual Property Organization, 1993. English \| E 224:454(E) \| Detailed record - Similar records
2.	Methodological Challenges for Creating Accurate Patent Indicators. Schmoch, Ulrich, author. ; Khan, Mosahid, author. ; Springer Publishing [Singapore] : Springer Singapore, 2019. English \| View e-resource \| Available Online \| Detailed record - Similar records
3.	Index officiel des mots clés pour la cinquième édition (1989) de la Classification internationale des brevets. Organisation Mondiale de la Propriété Intellectuelle issuing body. München, Germany : Heymann, 1989. 5e. French \| 608.012016\|E 348G1329 OMPI.IPC(5) INDEX \| Detailed record - Similar records
4.	International patent classification. World Intellectual Property Organization. Geneva, Switzerland : World Intellectual Property Organization, 2005. Eighth edition. French \| 608.012\|E 348G1329 WIPO.IPC(8) \| Detailed record - Similar records

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