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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
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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)
