Piccardi
{{PatentInfo |Inventor=Gerardo Hendrik va Spankeren |Assignee=Eterpen Sociedad Anonima Financiera |Country=US |ApplicationNum=508977 |ApplicationDate=1943-11-04 |PatentNum=2405381 |PatentDate=1946-08-06 |PriorityDate=1943-04-26 |Titolo=Writing instrume...