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* [https://web.archive.org/web/20160401024154/http://www.lucavalente.it/modules.php?name=News&file=article&sid=126] Luca Valente article about the company's history
* [https://web.archive.org/web/20160401024154/http://www.lucavalente.it/modules.php?name=News&file=article&sid=126] Luca Valente article about the company's history
* [https://web.archive.org/web/20140107065837/http://www.pentrace.net/penbase/Data_Returns/full_article.asp?id=416] PenTrace article about the company's history
* [https://web.archive.org/web/20140107065837/http://www.pentrace.net/penbase/Data_Returns/full_article.asp?id=416] PenTrace article about the company's history
* [https://forum.fountainpen.it/viewtopic.php?t=34492] Dissection of a [[Penco 53]] cap showing the clip attachment
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