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Finally, a particular version is the one of the [[Eversharp]] [[Skyline]], which could also be classified as a [[Filling systems#Breather_tube_fillers|breather tube filler]]. In this case, in fact, inside the rubber sac there is a breather tube, and the ''[[spring bar]]'' is very short and aimed at compressing only the final part of the bag. The pen is loaded by repeating the pressure action several times with the lever, using the classic principle of the breather tube filler. Similar to this, even if realized in a completely different way, is the [[Waterman]] ''[[Ink-Vue]]''.<noinclude>
==Related Patents==
{{ListsPatentsFeature|lever filler}}
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