File:PSM V45 D487 Shield used in st slair tunnel excavation.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 18:12, 20 February 2011 | 1,417 × 1,314 (334 KB) | Ineuw | {{Information |Description = Shield used in St Clair tunnel excavation |Source = [http://www.archive.org/details/popularsciencemo45newy Popular Science Monthly Volume 45] |Date = 1894 |Author = Unknown |Permission = { |
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