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{{PatentInfo |Inventor=Asahi Watanabe |Assignee=The Namiki Manufacturing Company Ltd |Country=US |ApplicationNum=31566 |ApplicationDate=1935-07-16 |PatentNum=2070461 |PatentDate=1937-02-09 |PriorityDate=1935-07-16 |Titolo=Piston fountain pen |Marca=Pil...