File:Switching Systems BLW Switch frame from Post Office (London) Railway (Mail Rail) (1) Attribution.jpg
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Switching_Systems_BLW_Switch_frame_from_Post_Office_(London)_Railway_(Mail_Rail)_(1)_Attribution.jpg (800 × 533 pixels, file size: 71 KB, MIME type: image/jpeg)
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current | 21:48, 10 February 2012 | 800 × 533 (71 KB) | Beichner (talk | contribs) |
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