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New techniques for trolley carrier-phone systems.
Dobroski-H Jr.; Spencer-RH
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 8744, 1977 Jan; :3-11
IH; Information Circular
Pittsburgh, PA: U.S. Department of the Interior, Bureau of Mines, IC 8744
Page last reviewed: March 11, 2019
Content source: National Institute for Occupational Safety and Health Education and Information Division