Piccardi
{{PatentInfo |Inventor=Hans P. Ravn |Assignee=Hans P. Ravn |Country=US |ApplicationNum=199005 |ApplicationDate=1917-10-29 |PatentNum=1258458 |PatentDate=1918-03-05 |PriorityDate=1917-10-29 |Titolo=Fountain-Pen |Marca=Welty |Descrizione=[[Caricamento a ...