Piccardi
{{PatentInfo |Inventor=Robert S. Dorfman |Assignee=Robert S. Dorfman |Country=US |ApplicationNum=250147 |ApplicationDate=1939-01-10 |PatentNum=2219769 |PatentDate=1940-10-29 |PriorityDate=1939-01-10 |Titolo=Mechanical pencil |Marca=Unbranded |Descrizio...