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Electric Switches for use in Gaseous Mines
| Author: | Clark, H. H. |
|---|---|
| Year: | 1913 |
| Document Type: | N/A |
| Issuing Agency: | United States. Bureau of Mines. |
| Series: | United States Bureau of Mines Reports |
| Report Number: | [Bulletin 68] |
| Link: | https://digital.library.unt.edu/ark:/67531/metadc12281/ |
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