Potential uses for 400 Hz electrical power systems in mining

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086 0 ‡aI 28.23:7857
100 1 ‡aConroy, George J.
245 1 0 ‡aPotential uses for 400 Hz electrical power systems in mining / ‡cby G. J. Conroy.
260 ‡a[Washington, D.C.] : ‡bU.S. Bureau of Mines, ‡c[1974]
300 ‡a10 p. : ‡billus., tables ; ‡c26 cm.
490 0 ‡aReport of investigations / United States. Bureau of Mines ; ‡v7857
504 ‡aIncludes bibliography (p. 10).
538 ‡aMode of access: Internet.
650 0 ‡aElectricity in mining.
650 0 ‡aMine safety.
710 2 ‡aPittsburgh Mining and Safety Research Center.
710 1 ‡aUnited States. ‡bBureau of Mines.
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