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Ultra low frequency electromagnetic fire alarm system for underground mines / by K.E. Hjelmstad and W.H. Pomroy.

By: Hjelmstad, K. E.
Contributor(s): Pomroy, W. H | United States Department of the Interior. Bureau of Mines.
Material type: materialTypeLabelBookSeries: Report of investigations ; 9377. Publisher: [Washing, D.C.] : Bureau of Mines, U.S. Dept. of the Interior, 1991Description: 11 p. : ill.Subject(s): Mine fires -- Prevention and control | Fire alarms
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