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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. Not many details are known about the company's own productions of fountain pens, although there are some advertisements around the 1930s that show them under their own brand name, but very little is known about them. The company has marketed in several cases pens produced by others (in particular it marketed throughout Europe the [[Waterman]], for which it maintained representation until the First World War), but sometimes it has also marketed pens under its own brand.

The company's activities in the fountain pen market derive mainly from the marketing of pens produced by others; in particular it marketed [[Waterman]] throughout Europe, for which they were the official agent until World War I. But sometimes there was also a marketing of own-brand fountain pens. Not many details are known about the company's own productions, although there are some advertisements around the 1930s that show own-branded ones but about which very little is known, and there is evidence of relations with the [[Union Vulpenhouderfabriek]] in the 1950s.<ref>like the one illustrated in [https://forum.fountainpen.it/viewtopic.php?t=32006 this presentation] on the Italian forum.</ref>

The company's activities in the fountain pen market derive mainly from the marketing of pens produced by others; in particular it marketed [[Waterman]] throughout Europe, for which they were the official agent until World War I. But sometimes there was also a marketing of own-brand fountain pens. Not many details are known about the company's own productions, although there are some advertisements around the 1930s that show own-branded ones but about which very little is known, and there is evidence of relations with the [[Union Vulpenhouderfabriek]] in the 1950s.<ref>like the one illustrated in [https://forum.fountainpen.it/viewtopic.php?t=32006 this presentation] on the Italian forum.</ref>