Case history of mine in West Virginia, working 7 1/2 ft of 8 1/2 ft Pittsburgh seam; rectangular block retreat mining system; equipment and supplies; crew and production.
Shuttle cars in block system; pillaring with development
Mechanization
Mechanization ; 10 , n 9
1946
4 pages
Aufsatz (Zeitschrift)
Englisch
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Engineering Index Backfile | 1949
|Shuttle cars in room-and-pillar block retreat panel system
Engineering Index Backfile | 1947
Engineering Index Backfile | 1952
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|Engineering Index Backfile | 1953
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