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List of manufacturers of permissible equipment and explosion-proof accessories, as of January 1, 1930
| Author: | Ilsley, L. C. |
|---|---|
| Year: | 1930 |
| Document Type: | USBI |
| Issuing Agency: | Dept. of Commerce, United States Bureau of Mines, |
| SUDOC: | C 22.11:6222 |
| Series: | Information circular / Bureau of Mines ; |
| Report Number: | 6222 |
| Subject: | Mineral industries--Equipment and supplies |
| Link: | https://hdl.handle.net/2027/mdp.39015077567736 |
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