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Review of practices; multiple purpose mining machines for extraction of coal and use of bolts or pins anchored in roof strata for supporting roofs are outstanding developments.
Review of practices; multiple purpose mining machines for extraction of coal and use of bolts or pins anchored in roof strata for supporting roofs are outstanding developments.
Modern coal mining -- Underground
Iron Steel Engr
Knapp, R.H. (Autor:in)
1955
5 pages
Aufsatz (Zeitschrift)
Englisch
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