File:Patent-US-2078433.pdf

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Brevetto per una matita meccanica. Riferimenti a n° US-2028855.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	00:00, 8 June 2021		1,159 × 1,704, 4 pages (296 KB)	Piccardi (talk \| contribs)	{{PatentInfo \|Inventor=Arthur Winter \|Assignee=Arthur Winter \|Country=US \|ApplicationNum=54978 \|ApplicationDate=1935-12-18 \|PatentNum=2078433 \|PatentDate=1937-04-27 \|PriorityDate=1935-12-18 \|Titolo=Lead feeding pencil \|Marca=Dictator \|Descrizione=Mati...

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