File:AdvancingLongwall.png
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Size of this preview: 406 × 600 pixels. Other resolutions: 162 × 240 pixels | 516 × 762 pixels.
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 16:54, 15 July 2009 | 516 × 762 (94 KB) | Douglas W. Jones | {{Information |Description= {{en|Origional caption: "Fig. 38. Panel Long-wall in Oklahoma." Plan of a multi-panel advancing longwall mine, circa 1917, using a face conveyor and rail haulage. The figure has been altered by moving the scale and legend.} |
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