File:Patent-US-1335580.pdf

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Brevetto per una penna con pennino ad innesto piatto, montato centralmente. Stessa invenzione di nº GB-164043.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	20:11, 23 March 2021		1,159 × 1,704, 3 pages (136 KB)	Piccardi (talk \| contribs)	{{PatentInfo \|Inventor=John E. Hayes \|Assignee=John E. Hayes \|Country=US \|ApplicationNum=178220 \|ApplicationDate=1917-07-02 \|PatentNum=1335580 \|PatentDate=1920-03-30 \|PriorityDate=1917-07-02 \|Titolo=Fountain-pen \|Marca=Unbranded \|Descrizione=Costruzion...

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