Underground mine communications, control and monitoring

Underground mine communications, control and monitoring

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6.2.5 Amplifier Loudness Each pager phone has a loudspeaker, powered by its own internal amplifier, that is switched on by ... During installation, the speaker should be oriented, and the volume set, to insure adequate coverage in the area.


Title:Underground mine communications, control and monitoring
Author:Pittsburgh Research Center (U.S.), United States. Bureau of Mines
Publisher: - 1984
ISBN-13:

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