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. |
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