Piccardi
{{PatentInfo |Inventor=George E. Barker |Assignee=The Mentmore Manufacturing Company Limited |Country=GB |ApplicationNum=23627/37 |ApplicationDate=1937-08-28 |PatentNum=501523 |PatentDate=1939-02-28 |PriorityDate=1937-08-28 |Titolo=Improvements in or r...