Piccardi
{{PatentInfo |Inventor=O'cal Hanson |Assignee=W. A. Sheaffer Pen Company |Country=US |ApplicationNum=316506 |ApplicationDate=1940-01-31 |PatentNum=2232231 |PatentDate=1941-02-18 |PriorityDate=1940-01-31 |Titolo=Tip for a marking instrument |Marca=Shea...