250 versus 500 volts or more for circuits in gassy coal mines / by L.C. Ilsley.
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| Other title: | Two-hundred fifty versus five-hundred volts or more for circuits in gassy coal mines. |
| Format: | Government Document Book |
| Language: | English |
| Published: |
Washington, D.C. :
U.S. Dept. of Commerce, Bureau of Mines,
1932.
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| Series: | Information circular (United States. Bureau of Mines) ;
6556. |
| Subjects: |
| Item Description: | At head of title: Department of Commerce--Bureau of Mines. No.6551-6571,6572-6575 issued bound together. |
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| Physical Description: | 16 pages ; 27 cm. |
| Action Note: | committed to retain 20170101 20420101 Alliance Shared Trust https://www.coalliance.org/shared-print-archiving-policies) |