Valdemar Poulsen: References & Edit History
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Article History
| Type | Description | Contributor | Date |
|---|---|---|---|
| Anniversary information added. | Nov 19, 2025 | ||
| Anniversary information added. | Jun 27, 2025 | ||
| First paragraph modernization. | Apr 02, 2024 | ||
| Invalidated site: National Inventors Hall of Fame - Valdemar Poulsen. | Jun 10, 2020 | ||
| Add new Web site: Engineering and Technology History Wiki - Biography of Valdemar Poulsen. | Feb 20, 2020 | ||
| Add new Web site: Lemelson-MIT - Telegraphone. | Jun 09, 2017 | ||
| Add new Web site: Lemelson-MIT - Biography of Valdemar Poulsen. | Mar 09, 2017 | ||
| Added photograph. | Nov 07, 2013 | ||
| Add new Web site: National Inventors Hall of Fame - Valdemar Poulsen. | Aug 12, 2013 | ||
| Added new Web site: University of Klagenfurt - Telegraphone - Valdemar Poulsen. | Jul 18, 2008 | ||
| Added new Web site: University of Klagenfurt - Telegraphone - Valdemar Poulsen. | Jul 18, 2008 | ||
| Added new Web site: Cartage.org - Valdemar Poulsen. | Jun 06, 2008 | ||
| Added new Web site: Cyber Philately - Biography of Valdemar Poulsen. | Jun 06, 2008 | ||
| Added new Web site: IEEE Virtual Museum - Biography of Valdemar Poulsen. | Jun 06, 2008 | ||
| Added new Web site: Museum of American Heritage - Biography of Valdemar Poulsen. | Jun 06, 2008 | ||
| Article added to new online database. | Jul 20, 1998 |
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