Electronic mine-shaft signal system at Magma Copper Co., Superior, Ariz.

Author: Loesche, H.C.
Year: 1945
Document Type: USBI
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
SUDOC: I 28.27:7318
Series: Information circular / United States Department of the Interior, Bureau of Mines ;
Report Number: 7318.
Subjects: Mine safety--Arizona
Copper mines and mining--Safety measures--Arizona
Link: https://hdl.handle.net/2027/mdp.39015074127385

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