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Factors that decrease the light of electric cap lamps

Maintaining the permissibility of electric cap lamps

Published Year

• 1930-1939 (2)

Subject

• Electric lamps (2) *
• Electricity in mining (1)

Author

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

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