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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

Published Year

• 1920-1929 (3) *

Subject

• Coal mines and mining--Safety measures (3) *
• Electricity in mining (3) *

Author

• Ilsley, L. C. (3)
• Kearns, R. A. (1)

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