Piccardi
{{PatentInfo |Inventor=Owen R. Terry |Assignee=Owen R. Terry |Country=US |ApplicationNum=421455 |ApplicationDate=1930-12-02 |PatentNum=1783681 |PatentDate=1930-01-17 |PriorityDate=1930-12-02 |Titolo=Fountain-Pen refill indicator |Marca=Unbranded |Descr...