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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
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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)
