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File:LongwallOld.png
From WikiMD's Food, Medicine & Wellness Encyclopedia
![File:LongwallOld.png](/w/images/thumb/9/91/LongwallOld.png/442px-LongwallOld.png)
Size of this preview: 442 × 599 pixels. Other resolution: 738 × 1,000 pixels.
Original file (738 × 1,000 pixels, file size: 133 KB, MIME type: image/png)
File history
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 15:15, 2 July 2009 | ![]() | 738 × 1,000 (133 KB) | Douglas W. Jones | {{Information |Description={{en|1=Original caption: "Fig. 24. -- Plan of individual roadway longwall mine." The three-compartment hoisting shaft is in the center of the central pillar, which is not mined in order to avoid subsidance around the hoist. T |
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- File:LongwallOld.png from Wikimedia Commons
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