Piccardi
{{PatentInfo |Inventor=John William Para |Assignee=David Kahn Inc |Country=US |ApplicationNum=356235 |ApplicationDate=1941-08-07 |PatentNum=2339290 |PatentDate=1944-01-18 |PriorityDate=1941-08-07 |Titolo=Mechanical pencil |Marca=Wearever |Descrizione=M...