displaying 1 - 5 results in total 5
Hjelmstad, K. E.; Pomroy, W. H.
view article (1.0)Electromagnetic Fire Warning System for Underground Mines.Bureau of Mines, Minneapolis, MNIC 9206,U.S. Department of the Interior, Bureau of Mines. Recent Developments in Metal and Nonmetal Mine Fire Protection. Bureau of Mines Technology Transfer Seminars. IC 9206. October 18-19; October 20-21; November 1-2; and November 3-4, 1988, Denver, CO; Detroit, MI; Las Vegas, NV; and Spokane, WA, 78-82 p., 1988Reimers, G. W.; Hjelmstad, K. E.
view article (1.0)Analysis of the Oxidation of Chalcopyrite, Chalcocite, Galena, Pyrrhotite, Marcasite, and Arsenopyrite.Bureau of Mines, Pittsburgh, PARI 9118, 1987, 23 p.Hjelmstad, K. E.
view article (1.0)Electromagnetic Fire Warning System for Underground Mines. Patent Application.Bureau of Mines, Minneapolis, MNPAT-APPL-7-201-235, May 2, 1988, 14 p.Hjelmstad, K. E.; Pomroy, W. H.
view article (1.0)Novel Fire Warning System for Underground Mines.Bureau of Mines, Minneapolis, MNMining Engineering, Vol. 42, No. 1, 107-112, January 1990Hjelmstad, K. E.; Pomroy, W. H.
view article (1.0)Ultra Low Frequency Electromagnetic Fire Alarm System for Underground Mines.Bureau of Mines, Minneapolis, MNRI 9377, 1991, 15 p.