Piccardi
{{PatentInfo |Inventor=David Kahn, Julius Kahn |Assignee=David Kahn Inc |Country=US |ApplicationNum=47704 |ApplicationDate=1935-10-31 |PatentNum=2249004 |PatentDate=1941-07-15 |PriorityDate=1935-10-31 |Titolo=Method of and apparatus for treating therm...