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Supplemental list of respiratory protective devices approved by the Bureau of Mines :additions to list published in Information Circular 7444

List of respiratory protective devices approved by the Bureau of Mines

Published Year

• 1940-1949 (1)
• 1950-1959 (1)

Subject

• Breathing apparatus (2)
• Respirators (Medical equipment) (2) *

Author

• Berger, Lawrence Bursley. (2) *
• Pearce, S. J. (1)

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