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Some hazards of conveyor loading in coal mines
Aerial tramways in the metal-mining industry.
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Published Year
1930-1939 (2) *
Subject
Conveying machinery (2) *
Aerial tramways (1)
Coal-mining machinery (1)
Mining machinery (1)
Author
Jeffers, C. W. (1)
Metzger, O. H. (1)
