Piccardi
{{PatentInfo |Inventor=George H. Doyle |Assignee=George H. Doyle, George A. Rogerson |Country=US |ApplicationNum=542670 |ApplicationDate=1922-03-10 |PatentNum=1596722 |PatentDate=1926-08-17 |PriorityDate=1922-03-10 |Titolo=Cap for fountain pens |Marca=...