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List of permissible mine equipment approved during 1940

Permissible mine equipment approved during 1942

Permissible mine equipment approved during 1943

Published Year

• 1940-1949 (3) *

Subject

• Coal mines and mining--United States--Safety measures (3)
• Mines safety--United States--Equipment and supplies (3) *

Author

• Gleim, E. J. (3)

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