Piccardi
{{PatentInfo |Assignee=Ramon de Echevarria |Country=US |ApplicationNum=369896 |ApplicationDate=1920-03-30 |PatentNum=1372608 |PatentDate=1921-03-22 |PriorityDate=1920-03-30 |Titolo=Ink-content-indicating fountain-pen |Marca=Unbranded |Descrizione=Siste...