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The ''Koh-i-Noor'' brand became the hallmark of the company, that with [[Faber Castell]] was one of the leading European pencils producers and is still on the market in the field of stationery and drawing tools. In [[1919]] the American branch was opened in Bloomsbury, New Jersey, and in [[1931]] factories in Poland and Romania were opened in cooperation with the then [[Johan Faber A. G.|Johann Faber]].<ref>according to [https://collection.sciencemuseumgroup.org.uk/people/cp118887/l-c-hardtmuth this reference].</ref>After World War II the factories in the eastern countries (Poland, Romania and Czechoslovakia) were nationalized, while the American subsidiary separated from the parent company, becoming ''"Koh-i-noor USA"''. Only the Austrian company retained its original ownership. In [[1957]] the [[Rotring|Riepe Works]] ceded to the ''"Koh-i-noor USA"'' the rights to the {{Cite patent|US|3020884}} of the ''"Rapidograph"''. To date, the European rights for the ''"L&C Hardtmuth"'' and ''"Koh-I-Noor"'' trademarks are held by ''"Crayomine"'', founded in [[1960]] in Vaduz.

The ''Koh-i-Noor'' brand became the hallmark of the company, that with [[Faber Castell]] was one of the leading European pencils producers and is still on the market in the field of stationery and drawing tools. In [[1919]] the American branch was opened in Bloomsbury, New Jersey, and in [[1931]] factories in Poland and Romania were opened in cooperation with the then [[Johan Faber A. G.|Johann Faber]].<ref>according to [https://collection.sciencemuseumgroup.org.uk/people/cp118887/l-c-hardtmuth this reference].</ref>After World War II the factories in the eastern countries (Poland, Romania and Czechoslovakia) were nationalized, while the American subsidiary separated from the parent company, becoming ''"Koh-i-noor USA"''. Only the Austrian company retained its original ownership. In [[1957]] the [[Rotring|Riepe Works]] ceded to the ''"Koh-i-noor USA"'' the rights to the {{Cite patent|US|3020884}} of the ''"Rapidograph"''. To date, the European rights for the ''"L. & C. Hardtmuth"'' and ''"Koh-I-Noor"'' trademarks are held by ''"Crayomine"'', founded in [[1960]] in Vaduz.