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This is the most recent revision of the list of approved respiratory protective apparatus issued by the Health and Safety Branch of the Bureau of Mines. Certificates of approval are issued only if the devices fulfil established requirements. These are discussed briefly in the circular.
List of Respiratory Protective Devices Approved by the Bureau of Mines. JAMA. 1941;116(25):2824. doi:10.1001/jama.1941.02820250090034
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