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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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    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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    wipo.int/classifications/ipc/en/
  4. Feb 2019
  5. bop.dacoruna.gal bop.dacoruna.gal
    2017_0000005985.pdf
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    bop.dacoruna.gal/bopportal/publicado/2017/07/18/2017_0000005985.pdf