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The ''button filler'' was introduced by [[Parker]] in 1913.<ref>at least as reported on [http://www.parkerpens.org/luckycurve.html this story] of the initial [[Parker]] models, the first [[Parker]] patents related to loading, {{Cite patent|US|1346045}} and {{Cite patent|US|1486246}}, are respectively from 1919 and 1922, certainly after the introduction, since the [[Duofold]] is also from 1922 and the system also appears in this 1916 [[:File:1916-11-Parker-LuckyCurve.jpg|advertising]], in [http://www.fountainpennetwork.com/forum/index.php/topic/250375-walker-davison-eyedropper/ this discussion] however is reported the purchase by the [[Parker]] of the patent {{Cite patent|US|787152}}, which is from 1905.</ref> The system was born from the need to find an alternative to the [[Sheaffer]] [[lever filler]] not copying the design thus avoiding all possible legal problems due to patents.
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<noinclude>{{ReferBox|Filling systems}}</noinclude>The ''button filler'' was introduced by [[Parker]] in 1913.<ref>at least as reported on [http://www.parkerpens.org/luckycurve.html this story] of the initial [[Parker]] models, the first [[Parker]] patents related to loading, {{Cite patent|US|1346045}} and {{Cite patent|US|1486246}}, are respectively from 1919 and 1922, certainly after the introduction, since the [[Duofold]] is also from 1922 and the system also appears in this 1916 [[:File:1916-11-Parker-LuckyCurve.jpg|advertising]], in [http://www.fountainpennetwork.com/forum/index.php/topic/250375-walker-davison-eyedropper/ this discussion] however is reported the purchase by the [[Parker]] of the patent {{Cite patent|US|787152}}, which is from 1905.</ref> The system was born from the need to find an alternative to the [[Sheaffer]] [[lever filler]] not copying the design thus avoiding all possible legal problems due to patents.

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