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Permissible mine equipment approved during the calendar year 1947 :supplement to Information Circular 7432
| Author: | Hooker, A. B. |
|---|---|
| Year: | 1947 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:7465 |
| Series: | Information circular / Bureau of Mines ; |
| Report Number: | 7465 |
| Subjects: | Mine safety |
| Mining machinery | |
| Coal mines and mining--Safety measures | |
| Link: | https://hdl.handle.net/2027/mdp.39015077578444 |
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