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Permissible explosives, mining equipment, and apparatus, approved prior to March 15, 1922

List of permissible mine equipment :approved to January 1, 1937

List of permissible mine equipment approved to January 1, 1940

List of permissible mine equipment approved to January 1, 1942

Published Year

• 1920-1929 (1)
• 1930-1939 (1)
• 1940-1949 (2)

Subject

• Coal mines and mining--Safety measures (4)
• Explosives (4) *

Author

• Ilsley, L. C. (4) *
• Fieldner, A. C. (1)
• Howell, S. P. (1)
• Parker, D. J. (1)

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