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The ''hump filler'' is basically a variation on the theme of the [[crescent filler]] in which the sac is compressed using a protruding element from a side opening of the pen. The element allows you to compress directly the rubber sac, the main differences between the variants of this filling system are the ways in which it ensures, more or less reliably, that the protrusion can not be pressed accidentally.

The ''hump filler'' is basically a variation on the theme of the [[crescent filler]] in which the sac is compressed using a protruding element from a side opening of the pen. The element allows you to compress directly the rubber sac, the main differences between the variants of this filling system are the ways in which it ensures, more or less reliably, that the protrusion can not be pressed accidentally.

Il sistema ebbe una certa diffusione all'inizio del 1900, come alternativa al successo del [[crescent filler]] della [[Conklin]], una delle versioni meglio realizzate era il cosiddetto ''[[Wawco]] filler'' ideato da William Welty (brevetto {{Cite patent|US|834542}}) ed usato per le penne prodotte da quest'ultimo sia con il marchio [[Wawco]] che con gli altri marchi in uso all'azienda. <noinclude>

The system had some diffusion at the beginning of 1900, as an alternative to the success of the [[Conklin]] [[crescent filler]], one of the best realized versions was the so-called ''[[Wawco]] filler'' conceived by William Welty (patent {{Cite patent|US|834542}}) and used for the pens produced by the latter both with the [[Wawco]] brand and with the other brands used by the company.<noinclude>

==Brevetti correlati==

==Related Patents==

{{ListaBrevettiFeature|hump filler}}

{{ListsPatentsFeature|hump filler}}

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