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  1. Oct 2023
  2. www.wipo.int www.wipo.int
    Guide to the International Patent Classification (2023)
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    1. kael 17 Oct 2023
      ipc classification patents wikipedia:en=Patent_classification wikipedia:en=International_Patent_Classification wikipedia:en=Strasbourg_Agreement_Concerning_the_International_Patent_Classification
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    wipo.int/edocs/pubdocs/en/wipo-guide-ipc-2023-en-guide-to-the-international-patent-classification-2023.pdf
  3. www.wipo.int www.wipo.int
    International Patent Classification (IPC)
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    1. kael 17 Oct 2023
      ipc classification patents wikipedia:en=Patent_classification wikipedia:en=International_Patent_Classification wikipedia:en=Strasbourg_Agreement_Concerning_the_International_Patent_Classification
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    wipo.int/classifications/ipc/en/