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O'Connor, L.: Approaching the challenges and costs of the North American Industrial Classification System (2000)
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Gasthuber, H.: Produktklassifikation/Produktbeschreibung als Gegenstand normativer Festlegungen (1989)
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Meinl, F.: ¬Der Begriff 'Sachmerkmal' als Ansatz für eine 'technische Ordnungslehre' (1989)
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- Klassifikation und Ordnung. Tagungsband 12. Jahrestagung der Gesellschaft für Klassifikation, Darmstadt 17.-19.3.1988. Hrsg.: R. Wille
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Schiffels, R.: Kategorien der Internationalen Patentklassifikation, insbesondere hinsichtlich der Einordnung von Produkten (1982)
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