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Some hazards of conveyor loading in coal mines
Permissible electrically operated hand-held coal drills
Multiple-shift mechanical mining in some bituminous coal mines.
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Published Year
1930-1939 (3) *
Subject
Coal-mining machinery (3) *
Bituminous coal industry--United States (1)
Conveying machinery (1)
Drills (1)
Author
Anderson, Robert L. (1)
Brunot, H. B. (1)
Gleim, E. J. (1)
Ilsley, L. C. (1)
Jeffers, C. W. (1)
Toenges, Albert L. (1)
