- Author
- Hjelmstad, K. E.
- Title
- Electromagnetic Fire Warning System for Underground Mines. Patent Application.
- Coporate
- Bureau of Mines, Minneapolis, MN
- Report
- PAT-APPL-7-201-235, May 2, 1988, 14 p.
- Distribution
- Available from National Technical Information Service
- Keywords
- mine fires | warning systems | radio equipment | tests
- Identifiers
- transmission of an electromagnetic signal; underground metal mines; electromagnetic signal; alerting miners of a mine fire