- Author
- U.S. Department of the Interior, Bureau of Mines
- Title
- Underground Mine Communications (In Four Parts). Part 3. Haulage Systems.
- Coporate
- Bureau of Mines, Philadelphia, PA
- Report
- IC 8744, 1977, 57 p.
- Keywords
- coal mines | communication networks | belt conveyors | safety
- Identifiers
- haulage; trolley-wire phone system