Piccardi
{{PatentInfo |Inventor=John C. Wahl |Assignee=The Wahl Company |Country=US |ApplicationNum=608954 |ApplicationDate=1922-12-26 |PatentNum=1506207 |PatentDate=1924-08-26 |PriorityDate=1922-12-26 |Titolo=Fastening device to be used in connection with mech...