Piccardi
{{PatentInfo |Inventor=Edward G. Knight |Assignee=Thomas De La Rue and Company |Country=GB |ApplicationNum=10400/36 |ApplicationDate=1936-04-08 |PatentNum=471612 |PatentDate=1937-09-08 |PriorityDate=1936-04-08 |Titolo=Improvements in or relating to sel...