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- Equipment, tools, and parts:
- Pager phones
- Document types:
- Contract reports
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Results 1 - 6 of 6
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12/1/1980 - Contract reports, Open File ReportsThe objective of this program was to design and build a self-contained system for remote monitoring of the atmosphere in mines. The system developed uses the mine pager phone line as the primary communication channel and also has the capability of using...
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10/1/1980 - Contract reportsThe object of this program was to extend the capabilities of visual paging systems both in size and functions in mines. The system developed uses the mine pager phone line for communication, monitoring, and remote control. The system was designed to be ...
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1/1/1978 - Contract reportsThis report presents system objectives and design criteria for an in-mine ultralow frequency radio paging system.
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4/1/1975 - Contract reportsThe pager phones used in many underground coal mines are battery-operated, party-line telephones with provisions for loudspeaker paging. The system is two-wire, non-polarized, and is operated by self-contained batteries. A description of the many teleph...
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1/1/1975 - Contract reportsWires leading to or from underground facilities can develop hazardous voltages because of lightning exposure. The locations of many mine portals are particularly susceptible to lightning effects. The application of protective devices to limit this poten...
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5/1/1973 - Contract reportsThe results of a two-year research effort aimed at improving communication systems in coal mines is reported, as well as a review of communication methods presently used in coal mines. Theoretical and-experimental results of a four pronged effort in the...
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Content source: National Institute for Occupational Safety and Health, Mining Program