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{{PatentInfo |Inventor=Duncan Mackinnon |Assignee=Duncan Mackinnon |Country=US |ApplicationNum=174965 |ApplicationDate=1875-06-18 |PatentNum=174965 |PatentDate=1876-03-21 |PriorityDate=1875-06-18 |Titolo=Improvements in fountain pen |Marca=MacKinnon |D...