Piccardi
{{PatentInfo |Inventor=Wilbur K. Olson, Lynn P. Martin |Assignee=W. A. Sheaffer Pen Company |Country=US |ApplicationNum=575407 |ApplicationDate=1945-01-31 |PatentNum=2473690 |PatentDate=1949-06-21 |PriorityDate=1945-01-31 |Titolo=Clip for writing instr...