Modifiche

nessun oggetto della modifica
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== Riferimenti esterni ==  
 
== Riferimenti esterni ==  
 
* [https://web.archive.org/web/20120106092952/http://www.kamakurapens.com/Archive/TheRHRPen.html] Articolo sull'ebanite rossa
 
* [https://web.archive.org/web/20120106092952/http://www.kamakurapens.com/Archive/TheRHRPen.html] Articolo sull'ebanite rossa
* [https://fountainpenhistory.blogspot.com/2014/04/watermans-first-rhr-pens.html] Articolo di George Kovalenko sulla prima apparizione del ''[[Cardinal]]'
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* [https://fountainpenhistory.blogspot.com/2014/04/watermans-first-rhr-pens.html] Articolo di George Kovalenko sulla prima apparizione del colore ''[[Cardinal]]''
 
* [https://fountainpenhistory.blogspot.com/2015/02/red-hard-rubber.html] Articolo di George Kovalenko sull'ebanite rossa
 
* [https://fountainpenhistory.blogspot.com/2015/02/red-hard-rubber.html] Articolo di George Kovalenko sull'ebanite rossa
 
* [https://fountainpenhistory.blogspot.com/2015/02/rhr-patents-and-trademarks.html] Articolo di George Kovalenko sui brevetti sull'ebanite rossa
 
* [https://fountainpenhistory.blogspot.com/2015/02/rhr-patents-and-trademarks.html] Articolo di George Kovalenko sui brevetti sull'ebanite rossa