Mine pager to public telephone interconnect system /

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Bibliographic Details
Main Author: Parkinson, Howard E.
Corporate Author: United States. Bureau of Mines
Format: Unknown
Language:English
Published: [Washington] : U.S. Dept. of the Interior, Bureau of Mines, [1974].
Series:Report of investigations (United States. Bureau of Mines) ; 7976
Subjects:
Telephone in mining.
Mine communications systems.
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Description
Physical Description:14 p. : ill.

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