Piccardi
{{PatentInfo |Inventor=Eric Ernest Samuel Wade, Charlesworth Livsey |Assignee=Eric Ernest Samuel Wade, Charlesworth Livsey |Country=GB |ApplicationNum=5085/47 |ApplicationDate=1947-02-21 |PatentNum=621354 |PatentDate=1949-04-07 |PriorityDate=1947-02-21...