Piccardi
{{PatentInfo |Inventor=William H. Lindemon |Assignee=W. A. Sheaffer Pen Company |Country=US |ApplicationNum=515898 |ApplicationDate=1931-02-24 |PatentNum=1905920 |PatentDate=1933-04-25 |PriorityDate=1931-02-24 |Titolo=Mechanical pencil |Marca=Sheaffer ...