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== External references ==
== External references ==
* http://www.pennaio.com/Sistemi_di_Riempimento.html
* [http://www.pennaio.com/Sistemi_di_Riempimento.html] Page of the original sketches used in this page
* http://www.richardspens.com/?page=ref/fillers/fillers.htm
* [http://www.richardspens.com/?page=ref/fillers/fillers.htm] Page on filling systems from Richard Binder's website
* http://www.rickconner.net/penspotters/filling.html
* [http://www.vintagepens.com/filling_instructions_vintage_pens.shtml] Page on filling systems from David Nishimura website
* http://www.rickconner.net/penoply/filling.html
* [https://web.archive.org/web/20180105095740/http://www.rickconner.net/penspotters/filling.html] Page on filling systems from Penspotters
* http://www.vintagepens.com/filling_instructions_vintage_pens.shtml
* [https://web.archive.org/web/20130616225156/http://www.pentrace.net/penbase/Data_Returns/full_article.asp?id=259] Article about filling systems on PenTrace, first part
* [https://web.archive.org/web/20130617013636/http://www.pentrace.net/penbase/Data_Returns/full_article.asp?id=266] Article about filling systems on PenTrace, second part
* http://www.pentrace.net/penbase/Data_Returns/full_article.asp?id=259&tname=Technical
* [http://www.penhero.com/PenGallery/Parker/ParkerDuofoldFiller.htm] Article of Jim Mamoulides on [[Parker]]'s [[button filler]]s
* http://www.penhero.com/PenGallery/Parker/ParkerDuofoldFiller.htm
* [https://www.penexchange.de/english/sites/klassiker/kolbenfueller.html] Article on Penexchange on [[piston filler]]
* https://www.penexchange.de/english/sites/klassiker/kolbenfueller.html
* [http://www.penexchange.de/english/sites/klassiker/pneumatik.html] Article on Penexchange on pneumatic fillers
* http://www.penexchange.de/english/sites/klassiker/pneumatik.html
* [http://www.penexchange.de/english/sites/klassiker/selbstfueller.html] Article on Penexchange on [[button filler]]s
* http://www.penexchange.de/english/sites/klassiker/selbstfueller.html
== Notes ==
== Notes ==