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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

Permissible mine equipment approved during 1957-58

Permissible mine equipment approved by the Bureau of Mines during 1959-60 :with appended lists of manufacturers of flame-resistant trailing cables and fire-resistant conveyor belts and holders of permits

Permissible mine equipment approved by the Bureau of Mines during 1965-66 :a supplement to Bulletin 543 and Information circulars 8220 and 8299

Permissible mine equipment approved by the Bureau of Mines during 1967-68 :a supplement to Bulletin 543 and Information circulars 8220, 8299, and 8372


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