Austrian patent classifications

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Revision as of 14:04, 17 February 2021 by AvionHerbert (talk | contribs) (more subcategories added with an emphasis on voluminously important AT 77d)
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Enclosing categories Patent category systems
Subcategories AT 20, AT 21a, AT 30, AT 37a, AT 42i, AT 46b, AT 61, AT 74, AT 77, AT 77b, AT 77d
Keywords
Start year
End year
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