File:Patent-US-2500833.pdf

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Brevetto per un sistema di caricamento a pompa piuttosto complesso. Riferimenti a nº US-335033 (non attinente le penne), nº US-605259 (non attinente le penne), nº US-1317817, nº US-1398779 (non attinente le penne), nº US-1469921, nº US-1818216, nº US-1902809, nº US-1904358, nº US-1980508, nº US-1985643, nº US-2093701 e nº US-2108552

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	00:39, 25 December 2020		1,159 × 1,704, 8 pages (517 KB)	Piccardi (talk \| contribs)	{{PatentInfo \|Inventor=Henry C. Klagges, Harry C. Kofke \|Assignee=The Estrerbrook Pen Company \|Country=US \|ApplicationNum=559514 \|ApplicationDate=1944-10-20 \|PatentNum=2500833 \|PatentDate=1950-03-14 \|PriorityDate=1944-10-20 \|Titolo= Fountain pen \|Marca...

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