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  1. Oct 2023
  2. www.uspto.gov www.uspto.gov
    Patent Classification
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    uspto.gov/patents/search/classification-standards-and-development
  3. Nov 2022
  4. www.programmableweb.com www.programmableweb.com
    Open EAN/GTIN Database
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    programmableweb.com/api/open-eangtin-database-rest-api
  5. opengtindb.org opengtindb.org
    Open EAN Database - Datenbank und Produktbewertung
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    opengtindb.org/api.php