Electronic mine-shaft signal system at Magma Copper Co., Superior, Ariz. / by H. C. Loesche.
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| Online Access: |
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| Main Author: | |
| Corporate Author: | |
| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington, D.C. :
U.S. Dept. of the Interior, Bureau of Mines,
1945.
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| Series: | Information circular (United States. Bureau of Mines) ;
7318. |
| Subjects: |
| Item Description: | At head of title: Department of Commerce--Bureau of Mines. No.7301-7325 issued bound together. |
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| Physical Description: | 4 pages : illustrations ; 26 cm. |
| Action Note: | committed to retain |