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Preliminary investigations of storage battery locomotives :specifications laboratory tests permissible schedule

State mining laws on the use of electricity in and about coal mines

Permissible explosives, mining equipment, and apparatus, approved prior to March 15, 1922

Development and safety of the storage-battery locomotive

Electrical motored equipment :approvals and extensions

Electrical accident prevention

Permissible junction boxes

State regulations governing the use of trolley wires in mines

Specially recommended trailing cable

List of motors available to prospective builders of permissible outfits

250 versus 500 volts or more for circuits in gassy coal mines

Evolution of methane detecting devices for coal mines

List of permissible mine equipment :approved to January 1, 1937

List of permissible mine equipment approved to January 1, 1940

List of permissible mine equipment approved to January 1, 1942


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