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DETAILS:
Not applicable
Permissible Mine
Communication Unit has MSHA approvel 9B-85.
Mining
Confined Space
A self-contained mine
communication system approved by Mine Safety and Health
Administration (MSHA), consisting of a speaker, a
telephone handset, a battery power supply and a
solid-state amplifier and associated circuitry. Components
are housed in a fiberglass, rubber-gasketed enclosure that
resists water and impact damage. The power supply is a
12-volt dry cell battery. Power is drawn only while the
unit is in operation. |
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