Underground mine communications
A DIAL-AND-PAGE TELEPHONE SYSTEM by James E . Alton1 ABSTRACT In 1973, the GAI-Tronics Corp. (GTC) , at the request of the American Electric Power (AEP) Service Co. for Southern Ohio Coal Co. Division, developed a mine ... It is connected to a PABX , or manual switch board, and provides private-line dial access to all other telephones connected to the PABX. This makes it more efficient toanbsp;...
| Title | : | Underground mine communications |
| Author | : | Pittsburgh Mining and Safety Research Center |
| Publisher | : | - 1977 |
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