Piccardi
{{PatentInfo |Inventor=Oscar F. Nilsson, Joseph Bachrach |Assignee=L. E. Waterman Company |Country=US |ApplicationNum=243504 |ApplicationDate=1927-12-30 |PatentNum=1853316 |PatentDate=1932-04-12 |PriorityDate=1927-12-30 |Titolo=Device for facilitating ...