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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.

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)

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