Piccardi
{{PatentInfo |Inventor=Ivan D. Tefft, Kenneth S. Parker |Assignee=Parker Pen Company |Country=US |ApplicationNum=542030 |ApplicationDate=1931-06-04 |PatentNum=1920770 |PatentDate=1933-08-01 |PriorityDate=1931-06-04 |Titolo=Mechanical pencil |Marca=Park...