Piccardi
{{PatentInfo |Inventor=Edward G. Knight |Assignee=Thomas De La Rue and Company |Country=GB |ApplicationNum=24239/30 |ApplicationDate=1930-08-13 |PatentNum=360918 |PatentDate=1931-11-13 |PriorityDate=1930-08-13 |Titolo=Improvements in or relating to mea...