Piccardi
{{PatentInfo |Inventor=John C. Wahl |Assignee=The Wahl Company |Country=US |ApplicationNum=444791 |ApplicationDate=1921-02-14 |PatentNum=1490246 |PatentDate=1924-04-15 |PriorityDate=1921-02-14 |Titolo=Mechanical pencil |Marca=Eversharp |Descrizione=Mat...