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Coal-mine fatalities in the United States, 1920 :and coal-mine statistics supplementing those published in Bulletin 115, and a list of permissible explosives, lamps, and motors tested prior to January 31, 1921

Factors that decrease the light of electric cap lamps

Maintaining the permissibility of electric cap lamps

Published Year

• 1920-1929 (1)
• 1930-1939 (2)

Subject

• Electric lamps (3) *
• Coal mine accidents--United States (1)
• Electric motors--Testing (1)
• Electricity in mining (1)
• Explosives--Testing (1)

Author

• Hooker, A. B. (2)
• Adams, W. W. (1)
• Zellers, D. H. (1)
• Zellers, Donald Henry, (1)

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