Two-hundred-fifty versus 500 volts or more for circuits in gassy coal mines [microform]
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| Other Authors: | |
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| Other title: | 250 versus 500 volts or more for circuits in gassy coal mines. |
| Format: | Government Document Microfilm Book |
| Language: | English |
| Published: |
Washington, D.C. :
[publisher not identified],
1932.
|
| Series: | Information circular (United States. Bureau of Mines) ;
6556. |
| Subjects: |
Norlin Library - Government Information - Microform
| Call Number: |
EBD C22.11-6556
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| EBD C22.11-6556 | Restricted Place a Hold |