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List of respiratory protective devices approved by the Bureau of Mines
| Author: | Schrenk, H. H. |
|---|---|
| Year: | 1943 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:7237 |
| Series: | Information circular ; |
| Report Number: | 7237 |
| Subjects: | Respirators (Medical equipment) |
| Breathing apparatus | |
| Mineral industries--Safety measures | |
| Gas masks | |
| Link: | https://hdl.handle.net/2027/mdp.39015074126916 |
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