Art
J-GLOBAL ID：201602013226021851 Reference number：58A0068469
Better Drill Cuts Cost at 40 to 1 Mine.
露天掘炭鉱において厚く,堅い被覆岩せん孔費を新さく岩法により1/40にした
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Material：
Coal Age (New York) (Coal Age (N.Y.))
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Volume：
63
Issue：
7
Page：
92-94
Publication year：
1958
JST Material Number：
B0284A
ISSN：
0009-9910
Document type：
Article
Country of issue：
United States (USA)
JST classification (1)：
JST classification
Category name(code) classified by JST.
(RA020102)
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Terms in the title (5)：
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露天掘
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炭鉱
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,
被覆岩
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せん孔
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,
さく岩
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