File:US Patent 661,619 - Magnetic recorder.jpg
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Summary
| Description | Figure 1 of United States Patent 661,619 by Danish inventor Valdemar Poulsen - the first magnetic recorder. |
| Date | Issued November 13, 1900. |
| Source | United States Patent Office. |
| Author | United States Patent Office, Valdemar Poulsen inventor. |
| Permission (Reusing this file) |
Public domain - original work of the US Federal Government. All text and figures in US Patents are in the public domain. |
Licensing
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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 Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 04:00, 21 March 2007 | | 1,641 × 2,648 (1.27 MB) | wikimediacommons>Daderot | {{Information |Description=Figure 1 of United States Patent 661,619 by Danish inventor Valdemar Poulsen - the first magnetic recorder. |Source=United States Patent Office. |Date=Issued November 13, 1900. |Author=United States Patent Office, Valdemar Pouls |
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