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{{PatentInfo |Inventor=Andreas Bienenstein |Assignee=The Conklin Pen Manufacturing Company |Country=US |ApplicationNum=620960 |ApplicationDate=1932-07-05 |PatentNum=1902811 |PatentDate=1933-03-28 |PriorityDate=1932-07-05 |Titolo=Plunger type pen |Marca...