File:Ernst Ruhmer radiotelephone transmitter circa 1905.jpg
Ernst_Ruhmer_radiotelephone_transmitter_circa_1905.jpg (664 × 498 pixels, file size: 172 KB, MIME type: image/jpeg)
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editDescriptionErnst Ruhmer radiotelephone transmitter circa 1905.jpg |
English: Photograph of Ernst Ruhmer radiotelephone transmitter circa 1905 |
Date | |
Source | Photograph included on page 47 of the 1918 edition of Radio Telephony, by Alfred N. Goldsmith |
Author | Book illustration |
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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.
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Note: This tag should not be used for sound recordings.PD-1923Public domain in the United States//commons.wikimedia.org/wiki/File:Ernst_Ruhmer_radiotelephone_transmitter_circa_1905.jpg |
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current | 00:12, 14 February 2018 | ![]() | 664 × 498 (172 KB) | Thomas H. White (talk | contribs) | User created page with UploadWizard |
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