File:PSM V17 D029 Circuits between two phones using the motograph.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 03:46, 16 August 2010 | 2,527 × 1,694 (233 KB) | Ineuw | {{Information |Description = Circuits between two phones using the motograph |Source = http://en.wikisource.org/wiki/Page:Popular_Science_Monthly_Volume_17.djvu/29 |Date = 1880 |Author = Unknown |Permission = {{PD-old}} |other_versions = }} [[Cate |
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