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Some signaling systems in metal-mine shafts
Mechanical Shoveling in Underground Metal Mines
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Published Year
1930-1939 (1)
1940-1949 (1)
Subject
Mine communication systems (1)
Mine safety (1)
Signals and signaling (1)
Author
Mosier, McHenry (2) *
Gleim, E. J. (1)
