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Mine pager to public telephone interconnect system
| Author: | Parkinson, Howard E. |
|---|---|
| Year: | 1974 |
| Document Type: | BMRA |
| Issuing Agency: | U.S. Bureau of Mines, |
| SUDOC: | I 28.23:7976 |
| Series: | Report of investigations / United States. Bureau of Mines ; |
| Report Number: | 7976 |
| Subjects: | Mine communication systems |
| Telephone in mining | |
| Link: | https://hdl.handle.net/2027/mdp.39015078484386 |
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