Piccardi
{{PatentInfo |Inventor=Edward G. Knight |Assignee=Thomas De La Rue and Company |Country=GB |ApplicationNum=19029/37 |ApplicationDate=1937-07-08 |PatentNum=495659 |PatentDate=1938-11-17 |PriorityDate=1937-07-08 |Titolo=Improvements in or relating to fou...