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Permissible electric lamps for miners
Why miners' portable electric lamps require safety devices
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Published Year
1910-1919 (1)
1920-1929 (1)
Subject
Electric lamps, Portable (2) *
Mines and mineral resources--Equipment and supplies (1)
Mines and mineral resources--Research (1)
Safety lamps (1)
Author
Clark, H. H. (1)
Ilsley, L. C. (1)
