Piccardi
{{PatentInfo |Inventor=Levi D. Van Valenburg |Assignee=Levi D. Van Valenburg |Country=GB |ApplicationNum=3257 |ApplicationDate=1911-02-08 |PatentNum=191103257 |PatentDate=1911-09-28 |PriorityDate=1911-02-08 |Titolo=Improvements in Devices for Preventin...