Browse TRAIL Inventories

Permissible electrically operated pumps

Mechanized mining brings new electrical hazards

List of permissible mine equipment approved during 1940

Inspection and testing of mine-type electrical equipment for permissibility

Permissible mine equipment approved during 1942

Prevention of fires caused by electric arcs and sparks from trolley wires

Permissible mine equipment approved during 1943

Ground-resistance measurements of drill-hole casings

Guarding trolley wires in mines


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