Piccardi
{{PatentInfo |Inventor=David Kahn |Assignee=David Kahn Inc |Country=US |ApplicationNum=172245 |ApplicationDate=1937-11-01 |PatentNum=2203093 |PatentDate=1940-06-04 |PriorityDate=1937-11-01 |Titolo=Mechanical pencil |Marca=Wearever |Descrizione=Matita m...