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Mine pager to public telephone interconnect system / by Howard E. Parkinson.

By: Parkinson, Howard E.
Contributor(s): United States. Bureau of Mines.
Series: United States. Report of investigations: 7976; Report of investigations (United States. Bureau of Mines): 7976Publisher: [Washington] : U.S. Dept. of the Interior, Bureau of Mines, [1974]Description: 14 p. : ill.Subject(s): Telephone in mining | Mine communications systems
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