Browse TRAIL Inventories

Permissible electrically operated pumps

List of permissible mine equipment approved to January 1, 1940

Permissible blasting units

Detailed study of 60-day nonfatal underground accidents in Pennsylvania bituminous coal mines during 1939

A quarter century of mechanized mining:notes on permissibility

List of permissible mine equipment approved to January 1, 1942

Permissible methane detectors

Investigations of Permissible Electric Mine Lamps, 1930-40

Some information on automatic coupling of mine cars


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