Piccardi
{{PatentInfo |Inventor=Ryosuke Namiki |Assignee=Ryosuke Namiki |Country=US |ApplicationNum=23167 |ApplicationDate=1925-04-14 |PatentNum=1600293 |PatentDate=1926-09-21 |PriorityDate=1925-04-14 |Titolo=Method of working upon surfaces of ebonite articles ...