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‡aI 28.23:7857
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‡aConroy, George J.
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‡aPotential uses for 400 Hz electrical power systems in mining /
‡cby G. J. Conroy.
|
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⊔ |
⊔ |
‡a[Washington, D.C.] :
‡bU.S. Bureau of Mines,
‡c[1974]
|
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⊔ |
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‡a10 p. :
‡billus., tables ;
‡c26 cm.
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‡aReport of investigations / United States. Bureau of Mines ;
‡v7857
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‡aIncludes bibliography (p. 10).
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‡aMode of access: Internet.
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‡aElectricity in mining.
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‡aMine safety.
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‡aPittsburgh Mining and Safety Research Center.
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‡aUnited States.
‡bBureau of Mines.
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