File:Ernst Ruhmer, Technical World cover (1905).jpg
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Ernst_Ruhmer,_Technical_World_cover_(1905).jpg (332 × 503 pixels, file size: 131 KB, MIME type: image/jpeg)
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Summary
| Description |
English: Drawing of Ernst Ruhmer listening at one station to his "photo-electric" optical wireless telephone system. |
| Date | |
| Source | Cover page, Technical World magazine, March 1905 |
| Author | Magazine cover |
Licensing
|
This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
 Public domain works must be out of copyright in both the United States and in the source country of the work in order to be hosted on the Commons. If the work is not a U.S. work, the file must have an additional copyright tag indicating the copyright status in the source country.
Note: This tag should not be used for sound recordings. |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 22:31, 29 January 2018 | | 332 × 503 (131 KB) | Thomas H. White | User created page with UploadWizard |
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