Piccardi
{{PatentInfo |Inventor=Walter A. Sheaffer, Craig R. Sheaffer |Assignee=Walter A. Sheaffer, Craig R. Sheaffer |Country=US |ApplicationNum=758539 |ApplicationDate=1920-01-30 |PatentNum=1641829 |PatentDate=1927-09-06 |PriorityDate=1924-12-29 |Titolo=Combi...