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Some signaling systems in metal-mine shafts

Mechanical Shoveling in Underground Metal Mines

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)

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