Piccardi
{{PatentInfo |Inventor=David Harrison |Assignee=The Wyvern Fountain Pen Co. |Country=GB |ApplicationNum=1983/49 |ApplicationDate=1949-01-25 |PatentNum=666145 |PatentDate=1952-02-06 |PriorityDate=1949-01-25 |Titolo=Improvements in or relating to Founta...