Modifiche

=== Riferimenti esterni===

=== Riferimenti esterni===

* http://www.richardspens.com/ref/anatomy/vacfil.htm

* [http://www.richardspens.com/ref/anatomy/vacfil.htm] Articolo di Richard Binde sul ''[[Vacuum-Fil]]''.

* http://www.penhero.com/PenGallery/Sheaffer/SheafferVacuumFilGuide.htm

* [http://www.penhero.com/PenGallery/Sheaffer/SheafferVacuumFilGuide.htm] Articolo di Jim Mamoulides sul  ''[[Vacuum-Fil]]''.

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===Note===

===Note===