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This mechanism has the advantage of having a shorter bottom, which makes the appearance of the pen more pleasant, this was even more evident in the first versions of the system, called "''[[lockdown]]''", in which the button, made with a metal cylinder with a lateral groove, could be kept in ''pressed'' position thanks to the presence of a "L" shaped end of the groove itself, which allowed it to be attached to the mechanism by a rotation, so then to allow the closure of the back itself (screw).
 
This mechanism has the advantage of having a shorter bottom, which makes the appearance of the pen more pleasant, this was even more evident in the first versions of the system, called "''[[lockdown]]''", in which the button, made with a metal cylinder with a lateral groove, could be kept in ''pressed'' position thanks to the presence of a "L" shaped end of the groove itself, which allowed it to be attached to the mechanism by a rotation, so then to allow the closure of the back itself (screw).
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Del sistema venne prodotta, a partire dal [[1937]], una seconda versione denominata "''[[speedline]]''", in cui la realizzazione era semplificata eliminando il sistema di bloccaggio. Questo comportava un fondello più lungo, ma venne pubblicizzato per la possibilità di effettuare il riempimento con una sola mano (in realtà per svitare il fondello se ne usano comunque due). Dal [[1942]] circa il sistema venne ulteriormente revisionato (con la versione chiamata "''[[speedline|wartime]]''" dai collezionisti) usando un pulsante in celluloide anziché in alluminio.<noinclude>
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A second version of the system, called "''[[speedline]]''", was produced starting from [[1937]], in which the realization was simplified by eliminating the locking system. This involved a longer bottom, but was advertised for the possibility of filling with one hand (in fact, to unscrew the bottom you still use two). Since [[1942]] about the system was further revised (with the version called "''[[speedline|wartime]]''" by collectors) using a button in celluloid instead of aluminum.<noinclude>
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[[Category:Translated Pages]]
 
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