Piccardi
{{PatentInfo |Inventor=William A. Welty, Hans P. Rawn |Assignee=William A. Welty, Hans P. Rawn |Country=US |ApplicationNum=224116 |ApplicationDate=1918-03-23 |PatentNum=1299642 |PatentDate=1919-04-08 |PriorityDate=1918-03-23 |Titolo=Fountain-Pen |Marca...