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===Riferimenti esterni===
===Riferimenti esterni===
* http://www.rickconner.net/penspotters/norma.pencils.html
* https://web.archive.org/web/20160322193802/http://rickconner.net/penspotters/norma.pencils.html
* http://www.roger-russell.com/normapg.htm
* http://www.roger-russell.com/normapg.htm
* http://www.fountainpennetwork.com/forum/index.php?/topic/228874-could-someone-tell-me-anything-about-this-pen
* http://www.fountainpennetwork.com/forum/index.php?/topic/228874-could-someone-tell-me-anything-about-this-pen