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Permissible blasting units

Permissible methane detectors

Investigations of Permissible Electric Mine Lamps, 1930-40

Permissible mine equipment approved during 1944

Fuel for permissible flame safety lamps :(a revision of RI 3389)

Permissible mine equipment approved to January 1, 1947 :with appended list of available flame-lamp fuels

Permissible mine equipment approved during the calendar year 1947 :supplement to Information Circular 7432

Published Year

• 1940-1949 (7) *

Subject

• Coal mines and mining--Safety measures (3)
• Mine safety (3)
• Mining machinery (3)
• Blasting (1)
• Fuel (1)
• Gas detectors (1)
• Methane (1)
• Safety lamps (1)

Author

• Hooker, A. B. (7) *
• Ilsley, L. C. (3)
• Coggeshall, E. J. (1)

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