electromagnetic system for detecting and locating trapped miners
By: by James A. Powell ; Pittsburgh Mining and Safety Research Center
Contributors: United States. Bureau of Mines
Series: Report of investigations - Bureau of Mines ; 8159; Report of investigations (United States. Bureau of Mines) -- 8159
Publisher: U.S. Dept. of Commerce, Bureau of Mines
Published: 1976
Place of publication: Washington
Language: eng
Number of pages: 15
Subjects: Mine communication systems; Mine safety