Piccardi
{{PatentInfo |Inventor=Robert George Crombie Boa |Assignee=The Wahl Company |Country=US |ApplicationNum=157945 |ApplicationDate=1917-03-28 |PatentNum=1367255 |PatentDate=1921-02-01 |PriorityDate=1917-03-28 |Titolo=Mechanical pencil |Marca=Eversharp |D...