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{{PatentInfo |Inventor=John C. Wahl |Assignee=The Wahl Company |Country=US |ApplicationNum=500555 |ApplicationDate=1921-09-14 |PatentNum=1490247 |PatentDate=1924-04-15 |PriorityDate=1921-09-14 |Titolo=Pencil |Marca=Eversharp |Descrizione=Matita meccani...