Modifiche

Schema of the [[Omas 361]] double writing nib. Excerpt from original patent ({{Cite patent|US|2565667}}) first page. Retouched by the author for a better sharpness.

Schema of the [[Omas 361]] double writing nib. Excerpt from original patent ({{Cite patent|US|2565667}}) first page. Retouched by the author for a better sharpness.

 

==Licenza==

==Licenza==

{{PD-US-patent}}{{GFDL-self-no-disclaimers}}

{{PD-US-patent}}{{GFDL-self-no-disclaimers}}