"United States. Patent Documentation Organizations." . . "Internationale Patentklassifikation." . . . . "Klassifikation." . . . . . . . . "Concordance, United States patent classification to international patent classification"@en . "Concordance, United States patent classification to international patent classification" . "United States patent classification to international patent classification" . "United States patent classification to international patent classification"@en . "Concordances" . . . "Konkordanz" . . "Konkordanz"@en . "Classification"@en . "Classification" . . . . . . . . . "Patent." . . "USA." . . "Patents United States Classification." . . "International Patent Classification" . .