Translations:Zerollo/1/en
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The Zerollo was founded in 1932 by David Dante Zerollo[1] 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.[2] 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 nº US-1893130 required in 1930 in Italy, in 1931 in the U.S.A. and awarded in 1933, the British patent nº GB-397736, approved August 31 , 1933 and the French patent nº FR-728038.[3]
- ↑ it seems however, that he was already active in the fields of mechanics applied to the stationery, holding a patent (nº US-1790037) for and automatic letters sealer, assigned into the U.S. in 1931 but applied since January 1929 in Germany.
- ↑ the idea of a double pen however is not so original, it appeared already in a 1912 patent (nº US-1020221).
- ↑ in patents are cited as inventors Chelazzi Mirko and Dino Frulli, presumably Zerollo employees.