Piccardi
{{PatentInfo |Inventor=Russel B. Kingman, Ralf L. Hartwell |Assignee=Russel B. Kingman |Country=US |ApplicationNum=61283 |ApplicationDate=1936-01-29 |PatentNum=2061405 |PatentDate=1936-11-17 |PriorityDate=1936-01-29 |Titolo=Soluble ink fountain pen |...