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It is unclear whether the production of plastic pens began around [[1939]], approximate date of the acquisition of [[Artus]], or only after the war. It is not clear even when it ceased to use the [[Orthos]] trademark, but at least until 1941 <ref>at least as reported in this [http://www.fountainpennetwork.com/forum/index.php?showtopic=19039 discussion].</ref> the brands coexisted sharing address and phone number, even during a change of venue took place in 1940.