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  • × type_ss:"a"
  • × year_i:[1970 TO 1980}
  1. Taube, U.-F.: ¬Die Internationale Patentklassifikation (IPC) und ihre Anwendung in der Bibliothek des Deutschen Patentamtes (1979) 6.68 
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  2. Herbig, E.: ¬Die Internationale Patentklassifikation (1978) 6.68 
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