Piccardi
{{PatentInfo |Inventor=Levi D. Van Valenburg |Assignee=Levi D. Van Valenburg |Country=US |ApplicationNum=158370 |ApplicationDate=1917-03-29 |PatentNum=1250533 |PatentDate=1917-12-18 |PriorityDate=1917-03-29 |Titolo=Retaining clip for fountain-pens |Mar...