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Internationale Patentklassifikation (1974 ff.)
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Manecke, H.-J.: Klassifikation, Klassieren (2004)
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Herbig, E.: ¬Die Internationale Patentklassifikation (1978)
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Internationale Patentklassifikation : Gesamtwerk (2001)
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Dahlberg, I.: Zukunftsperspektiven der Klassifikation und Indexierung (1986)
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