Image:Fleming Valve - US Patent 803,684.jpg
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[edit] Summary
| 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 Patent Office (John Ambrose Fleming, inventor). |
| Permission |
Public domain - original work of the US Federal Government. Note that the text and figures of all US Patents are in the public domain. |
[edit] Licensing
 |
This work is in the public domain in the United States because it is a work of the United States Federal Government under the terms of Title 17, Chapter 1, Section 105 of the US Code. See Copyright.
Note: This only applies to works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. العربية | Česky | Deutsch | Español | 한국어 | Italiano | 日本語 | Magyar | Français | Português | 简体中文 | 正體中文 | +/- < |
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