Army rooftop radio antennas. US Army officer standing by 'quad' radio antennas on a rooftop in Washington DC,USA. In the background is the Lincoln Memorial. Antennas are used to receive and transmit radio waves. Radio technology was first developed in the 1890s. Photographed on 24 March 1925 | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Library of Congress |
Bildgröße: | 4810 px × 3680 px |
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Eigentums-Rechte: | nicht erforderlich |
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