Ultra low frequency electromagnetic fire alarm system for underground mines / by K.E. Hjelmstad and W.H. Pomroy.
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Format: | Government Document Book |
Language: | English |
Published: |
Washington, D.C. (2401 E St., N.W., Washington 20241-0001) :
U.S. Dept. of the Interior, Bureau of Mines,
1991.
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Series: | Report of investigations (United States. Bureau of Mines) ;
9377. |
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