Search U.S. government technical reports digitized or harvested by TRAIL.
Suggested safety rules for installing and using electrical equipment in bituminous coal mines
State mining laws on the use of electricity in and about coal mines
State regulations governing explosion-proof type electric motors in coal mines
State regulations governing the use of trolley wires in mines
Specially recommended trailing cable
250 versus 500 volts or more for circuits in gassy coal mines
Maintenance of electrical mine equipment from the viewpoint of the safety inspector
Hazard of igniting coal by electric circuits in mines
Coal-mine fires of electrical origin :their cause and prevention