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Jan 08, 1998 · The third study is that of Harris et al. in 1974 (Ex. 27-11), who evaluated the performance of five half-mask dust respirators among 37 miners working in 4 coal mines. In-mask and ambient dust measurements were made throughout the workshifts, during which miners intermittently used respiratory protection. Types of Respirator Masks - The Home DepotIf the dust mask does not have a valve in the front and is made of paper instead of non-woven polypropylene fiber, its not a respirator. These simple masks can be worn during activities like mowing, gardening, sweeping and dusting. True dust respirator masks such as N95 respirators are designed to protect the wearer from airborne particles best three layer disposable civilian mask standards in disposable face mask. Protective Mouth Cover Face Mask Multi Layer Breathable Disposable for Individual and Family Use for Indoor Outdoor Home Office Travel (50 Pack) 3.9 out of 5 stars 74 $32.99 $ 32 . 99 ($0.66/Count)high quality civilian 3 layer face mask standards in cuba high quality civilian 3 layer face mask standards in cuba.. DescriptionWholesaleMade of

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