Piccardi
{{PatentInfo |Inventor=Russel B. Kingman, Daniel J. Mayer |Assignee=Russel B. Kingman |Country=US |ApplicationNum=710450 |ApplicationDate=1934-02-09 |PatentNum=1978675 |PatentDate=1934-10-30 |PriorityDate=1934-02-09 |Titolo=Soluble ink fountain pen |...