File:Fleming Valve - US Patent 803,684.jpg

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Description United States Patent 803,684; first sheet. Illustrations of the 'Fleming Valve', the first useful vacuum tube. John Ambrose Fleming, inventor.
Date
Source United States Patent Office.
Author United States Patent Office (John Ambrose Fleming, inventor).
Permission
(Reusing this file)		 Public domain - original work of the US Federal Government. Note that the text and figures of all US Patents are in the public domain.

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Public domain
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Federal Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
This file has been identified as being free of known restrictions under copyright law, including all related and neighbouring rights.

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7 November 1905Gregorian

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current01:32, 5 March 2007Thumbnail for version as of 01:32, 5 March 20071,567 × 2,626 (823 KB)wikimediacommons>Daderot{{Information |Description=United States Patent 803,684; first sheet. Illustrations of the 'Fleming Valve', the first useful vacuum tube. John Ambrose Fleming, inventor. |Source=United States Patent Office. |Date=November 7,. 1905. |Author=United States P

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