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The factor of safety in mine electrical installations

Portable electric mine lamps

Published Year

• 1910-1919 (2) *

Subject

• Electricity in mining--Safety measures (2) *
• Electric lamps, Portable--Design and construction (1)
• Electric lamps, Portable--Safety measures (1)
• Mine explosions--Prevention (1)

Author

• Clark, H. H. (2)

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