File:Collier's 1921 Coal - Jeffrey loading conveyor.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 20:36, 2 November 2017 | 1,481 × 858 (570 KB) | Bob Burkhardt | {{Information |Description ={{en|1=JEFFREY LOADING CONVEYOR USED IN A COAL MINE.}} |Source =“Coal,” ''Collier's New Encyclopedia'', v. 3, 1921, p. 31. |Author =unknown artist |Date =published 1921 |Permission ={{PD-... |
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