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<noinclude>{{ReferBox|Filling systems}}</noinclude>The ''bottom lever filler'', also called ''rear lever filler'', is a special lever filling system designed by [[Aurora]] and used from around 1930 for the [[Internazionale]] model, and later used also on the [[Novum]]. There are no known variants of this system used by other manufacturers, even if there are several patents with similar mechanisms, except the [[switch filler]] of the [[Pilot]], which has some similarities, in particular with the variant of this system adopted later on the [[Superna]] model.
The ''bottom lever filler'', also called ''rear lever filler'', is a special lever filling system designed by [[Aurora]] and used from around 1930 for the [[Internazionale]] model, and later used also on the [[Novum]]. There are no known variants of this system used by other manufacturers, even if there are several patents with similar mechanisms, except the [[switch filler]] of the [[Pilot]], which has some similarities, in particular with the variant of this system adopted later on the [[Superna]] model.
[[Image:levetta di fondo.jpg|thumb|250px|Diagram of a pen with ''bottom lever filler'']]
[[Image:levetta di fondo.jpg|thumb|250px|Diagram of a pen with ''bottom lever filler'']]
In essence the ''bottom lever filler'' creates a sort of combination between the principle of the lever and the mechanism used in the [[button filler]]. In this case the lever is very short and positioned on a slot made on the bottom of the pen, the lever must be raised from its resting position, in which it is folded inside the bottom, and at that point pushing it further you go to operate an internal pressure bar similar to those used in the [[button filler]], which arching compresses the sac.
In essence the ''bottom lever filler'' creates a sort of combination between the principle of the lever and the mechanism used in the [[button filler]]. In this case the lever is very short and positioned on a slot made on the bottom of the pen, the lever must be raised from its resting position, in which it is folded inside the bottom, and at that point pushing it further you go to operate an internal pressure bar similar to those used in the [[button filler]], which arching compresses the sac.