Piccardi
{{PatentInfo |Inventor=John E. Wahl, Carl W. Gronemann, Arthur N. Lungren |Assignee=The Wahl Company |Country=US |ApplicationNum=183431 |ApplicationDate=1927-04-13 |PatentNum=1825932 |PatentDate=1932-07-19 |PriorityDate=1927-04-13 |Titolo=Means for mak...