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Internationale Patentklassifikation (1974 ff.)
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Herbig, E.: ¬Die Internationale Patentklassifikation (1978)
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Internationale Patentklassifikation : Gesamtwerk (2001)
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Becker, U.: Lexikon der Symbole (1992)
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Einführung in die Handhabung der Internationalen Patentklassifikation (1977)
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