File:Ernst Ruhmer, Technical World cover (1905).jpg
Ernst_Ruhmer,_Technical_World_cover_(1905).jpg (332 × 503 pixels, file size: 131 KB, MIME type: image/jpeg)
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editDescriptionErnst Ruhmer, Technical World cover (1905).jpg |
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 |
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editPublic domainPublic domainfalsefalse |
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.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Ernst_Ruhmer,_Technical_World_cover_(1905).jpg |
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current | 22:31, 29 January 2018 | 332 × 503 (131 KB) | Thomas H. White (talk | contribs) | User created page with UploadWizard |
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