Piccardi
{{PatentInfo |Inventor=William A. Welty |Assignee=William A. Welty |Country=US |ApplicationNum=34608 |ApplicationDate=1916-03-16 |PatentNum=1212297 |PatentDate=1917-01-16 |PriorityDate=1916-03-16 |Titolo=Fountain-Pen |Marca=Welty |Descrizione=Sistema d...