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Internationale Patentklassifikation (1974 ff.)
2.69
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Gesell, J.: Neuauflage der Internationalen Patentklassifikation : incompatibility issues of library classification systems and subject headings in subject cataloguing (1986)
2.38
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Internationale Patentklassifikation : Gesamtwerk (2001)
2.15
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Einführung in die Handhabung der Internationalen Patentklassifikation (1977)
1.61
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Schiffels, R.: Kategorien der Internationalen Patentklassifikation, insbesondere hinsichtlich der Einordnung von Produkten (1982)
1.34
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