Piccardi
{{PatentInfo |Inventor=William P. De Witt |Assignee=William P. De Witt |Country=US |ApplicationNum=13455 |ApplicationDate=1935-03-28 |PatentNum=2129655 |PatentDate=1938-09-13 |PriorityDate=1935-03-28 |Titolo=Pencil |Marca=De Witt-La France |Descrizione...