Piccardi
{{PatentInfo |Inventor=David Kahn |Assignee=David Kahn Inc |Country=US |ApplicationNum=231584 |ApplicationDate=1938-09-24 |PatentNum=2186870 |PatentDate=1940-01-09 |PriorityDate=1938-09-24 |Titolo=Mechanical pencil |Marca=Wearever |Descrizione=Matita m...