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A Multiplexed Phone System For Small Mines
  • Published Date:
  • Source:
    Proceedings of the Sixth WVU Conference on Coal Mine Electrotechnology, Morgantown, West Virginia, July 28-30, 1982. Cooley WL, ed., Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, Contract J0123017, 1982 Nov; :116-123
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