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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.

<noinclude>{{ReferBox|Filling systems}}</noinclude>The ''top lever filler'' is a particular lever filling system used by [[Aurora]] from around 1930 for the [[Internazionale]] model, and later also on the [[Novum]]. The first version of this filling system however, was used by [[Curzon]] for the ''[[Top Lever]]'' model (later renamed ''[[Debrett's]]'') of 1926. Since the patent of the ''[[Top Lever]]'' ({{Cite patent|GB|273357}} and {{Cite patent|FR|628272}} which is even more similar to the mechanism found on the [[Aurora]]) is from 1926, it is incorrect to attribute the invention of this system to the [[Aurora]]. There are no other known variants of the system used by other manufacturers 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.