File:Telephone Switching Systems B Board Machine Originated Calls.jpg
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Telephone_Switching_Systems_B_Board_Machine_Originated_Calls.jpg (612 × 489 pixels, file size: 318 KB, MIME type: image/jpeg)
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current | 22:50, 15 February 2012 | 612 × 489 (318 KB) | Beichner (talk | contribs) |
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