Effect of ultralow frequency signaling on blasting array current /
by Kenneth E. Hjelmstad and Russell E. Griffin.
- Avondale, Md. : U.S. Dept. of the Interior, Bureau of Mines, 1993.
- 7 p.
- Report of investigations ; 9479 .
- Report of investigations (United States. Bureau of Mines) ; 9479 .
Mines and mineral resources.
Electric detonators--Safety measures.
Electromagnetic waves--Transmission.
Fire alarms.
Mines and mineral resources.
Electric detonators--Safety measures.
Electromagnetic waves--Transmission.
Fire alarms.