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Riga 51:
Riga 51: − + +
nessun oggetto della modifica
* [http://www.sheaffer.com/] Sito ufficiale della Sheaffer
* [http://www.sheaffer.com/] Sito ufficiale della Sheaffer
* [http://en.wikipedia.org/wiki/Sheaffer] La Sheaffer su Wikipedia
* [http://en.wikipedia.org/wiki/Sheaffer] La Sheaffer su Wikipedia
* [https://drive.google.com/file/d/1Xx3a0oPWybPyEQhPNUxhtecl4MQZr2jd/view] Dettagliato documento sulla storia della Sheaffer fino al 1952 (dalla [https://pencollectorsofamerica.org/reference-library/sheaffer/ Reference Library] della PCA)
* [https://vintagepens.com/first_Sheaffers.htm] Articolo di David Nishimura sulla produzione iniziale della ditta
* [https://drive.google.com/file/d/1Xx3a0oPWybPyEQhPNUxhtecl4MQZr2jd/view] Dettagliato documento sulla storia della ditta fino al 1952 (dalla [https://pencollectorsofamerica.org/reference-library/sheaffer/ Reference Library] della PCA)
* [http://www.penhero.com/PenGallery/Sheaffer/Sheaffer.htm] PenHero.com: PenGallery: Sheaffer
* [http://www.penhero.com/PenGallery/Sheaffer/Sheaffer.htm] PenHero.com: PenGallery: Sheaffer
* [https://web.archive.org/web/20060323153049/http://www.penlovers.com/index.cfm?t=collections&s=sheaffer] Pen Lovers: Sheaffer Collection
* [https://web.archive.org/web/20060323153049/http://www.penlovers.com/index.cfm?t=collections&s=sheaffer] Pen Lovers: Sheaffer Collection