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

Some information on automatic coupling of mine cars

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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