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Permissible mine equipment approved during 1944

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 (3)

Subject

• Coal mines and mining--Safety measures (3)
• Mine safety (3)
• Mining machinery (3) *

Author

• Hooker, A. B. (3) *

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