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Supplemental list of respiratory protective devices approved by the Bureau of Mines :additions to list published in Information Circular 7444
| Author: | Berger, Lawrence Bursley. |
|---|---|
| Year: | 1949 |
| Document Type: | USBI |
| Issuing Agency: | U.S. Dept. of the Interior, Bureau of Mines, |
| SUDOC: | I 28.27:7513 |
| Series: | Information circular / Bureau of Mines ; |
| Report Number: | 7513 |
| Subjects: | Breathing apparatus |
| Respirators (Medical equipment) | |
| Link: | https://hdl.handle.net/2027/mdp.39015078463489 |
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