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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.
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==Licenza==
 
==Licenza==
 
{{PD-US-patent}}{{GFDL-self-no-disclaimers}}
 
{{PD-US-patent}}{{GFDL-self-no-disclaimers}}

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