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Minimizing fire hazards in coal mines by proper circuit-breaker protection of 250/275-volt direct-current systems
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Published Year
1950-1959 (1) *
Subject
Coal mines and mining--Safety measures (1)
Electric circuit-breakers (1) *
Electric circuits--Direct current--Safety measures (1)
Mine fires--Prevention and control (1)
Author
Gallagher, F. J. (1)
