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<noinclude>{{Infobox_Brand|Zerollo}}</noinclude>The ''Zerollo'' was founded in [[1932]] by ''David Dante Zerollo ''<ref>it seems however, that he was already active in the fields of mechanics applied to the stationery, holding a patent ({{Cite patent|US|1790037}}) for and automatic letters sealer, assigned into the U.S. in 1931 but applied since January 1929 in Germany.</ref> in Genoa for the production of one of the most original ever made pens, equipped by special telescopic system that allowed alternating between two different pens contained in a single body, extracting either one and then the other.<ref>the idea of a double pen however is not so original, it appeared already in a 1912 patent ({{Cite patent|US|1020221}}).</ref> The pen was protected, according to the manufacturer, by patents obtained from all over the world, but the only known are the U.S. Patent {{Cite patent|US|1893130}} required in 1930 in Italy, in 1931 in the U.S.A. and awarded in 1933, the British patent {{Cite patent|GB|397736}}, approved August 31 , 1933 and the French patent {{Cite patent|FR|728038}}.<ref> in patents are cited as inventors Chelazzi Mirko and Dino Frulli, presumably Zerollo employees.</ref>
<noinclude>{{Infobox_Brand|Zerollo}}</noinclude>The ''Zerollo'' was founded in [[1932]] by ''David Dante Zerollo''<ref>it seems however, that he was already active in the fields of mechanics applied to the stationery, holding a patent ({{Cite patent|US|1790037}}) for and automatic letters sealer, assigned into the U.S. in 1931 but applied since January 1929 in Germany.</ref> in Genoa for the production of one of the most original ever made pens, equipped by special telescopic system that allowed alternating between two different pens contained in a single body, extracting either one and then the other.<ref>the idea of a double pen however is not so original, it appeared already in a 1912 patent ({{Cite patent|US|1020221}}).</ref> The pen was protected, according to the manufacturer, by patents obtained from all over the world, but the only known are the U.S. Patent {{Cite patent|US|1893130}} required in 1930 in Italy, in 1931 in the U.S.A. and awarded in 1933, the British patent {{Cite patent|GB|397736}}, approved August 31 , 1933 and the French patent {{Cite patent|FR|728038}}.<ref> in patents are cited as inventors Chelazzi Mirko and Dino Frulli, presumably Zerollo employees.</ref>
[[File:Zerollo-Small-Lady-LightBlueStriated-Open.jpg|thumb|A ''Zerollo'']]
[[File:Zerollo-Small-Lady-LightBlueStriated-Open.jpg|thumb|A ''Zerollo'']]
For the particularity of his fountain pens, combined with the lack of production and even more limited availability of working models, a ''Zerollo'' is among the most collectible fountain pens models, reaching high prices, even if the historical importance of the company, especially in relation to the international scene, is relatively marginal.
For the particularity of his fountain pens, combined with the lack of production and even more limited availability of working models, a ''Zerollo'' is among the most collectible fountain pens models, reaching high prices, even if the historical importance of the company, especially in relation to the international scene, is relatively marginal.
==External References==
* [https://web.archive.org/web/20101128014503/http://www.pentrace.net/article112300025.html] Article on PenTrace
* [https://web.archive.org/web/20101128014503/http://www.pentrace.net/article112300025.html] Article on PenTrace
* [http://www.fountainpennetwork.com/forum/index.php?showtopic=4467&st=0&#entry116468] Discussion on FPN
* [http://www.fountainpennetwork.com/forum/index.php?showtopic=4467&st=0&#entry116468] Discussion on FPN
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==Notes==
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{{BrandData|Founder=Dante Davide Zerollo|Place=Genova|Date=1932|Country=IT}}{{CategorizeBrand|Italia|Secondary brand}}
{{BrandData|Founder=Dante Davide Zerollo|Place=Genova|Date=1932|Country=IT}}{{CategorizeBrand|Italia|Secondary brand}}</noinclude>