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Mine rescue life-line telephone assemblies

Electric blasting switches, underground mines, Lake Superior district

Safe equipment, guards, and practices, Lake Superior district iron-ore mines

Support of ground, iron-ore mines, Lake Superior district

Published Year

• 1940-1949 (4) *

Subject

• Ground control (Mining)--Lake States (2)
• Iron mines and mining--Lake States--Safety measures (2)
• Mine safety--Lake States (2)
• Iron mines and mining--Lake States (1)
• Mine rescue work (1)
• Mine safety--Equipment and supplies (1)

Author

• Petersen, Max S. (4) *
• Cash, Frank E. (3)
• Cash, F. E. (1)
• Forbes, J. J. (1)
• Griffith, F. E. (1)

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