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| View Original: | Photophone.jpg (450x196) | |||
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| Courtesy of: | commons.wikimedia.org | More Like This | ||
| Keywords: Photophone.jpg en Diagram of the Photophone From http //histv2 free fr/bell/bell5 htm The image is taken from Alexander Graham Bell's 1880 paper http //histv2 free fr/bell/bell5 htm Alexander Graham BELL Ph D 1880-10 PD-old Telecommunications Alexander Graham Bell History of telephony Photophone | ||||
