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(1) F E = C 0 C 1 C 0 × 100 % Where FE represents the filtration efficiency of the dust mask. C 1 represents the dust concentration entering the mask only through the filtration element (mg/m 3). C 0 represents the ambient dust concentration (mg/m 3). The definition of the inward leakage of the dust mask is shown in Eq. .

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H3-6 Mines, surface or subsurface, explosive or nonexplosive. (See also S76 Mines.) H3-7 Sea and gulfweed. H3-8 Wrecks (vessels fast to bottom or stranded). H3-9 Clearance of structures over navigable waters. Obstructions to air navigation (high buildings, towers, H3-10 chimneys, flagpoles, high-tension wires, etc.). H4 METEOROLOGY AND AEROLOGY.

Full text of "The Times , 1986, UK, English"

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N95 masks protect against 95% of airborne particles. N99 masks protect against 99% of airborne particles. The efficiency doesn’t refer to the particle size, it refers to the amount of leakage. So the N95 mask has slightly more leakage than the N99 mask. Respirators & Safety Masks at Lowes

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U.S. Navy Filing Manual Online Folks, The purpose of the Navy Filing Manual, Fourth Edition, 1941, was to provide a uniform, efficient, and time saving method for recording, filing and finding correspondence.The manual describes how Navy records were stored and retrieved from during World War II and beyond.

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H3-6 Mines, surface or subsurface, explosive or nonexplosive. (See also S76 Mines.) H3-7 Sea and gulfweed. H3-8 Wrecks (vessels fast to bottom or stranded). H3-9 Clearance of structures over navigable waters. Obstructions to air navigation (high buildings, towers, H3-10 chimneys, flagpoles, high-tension wires, etc.). H4 METEOROLOGY AND AEROLOGY.

Full text of "The Times , 1986, UK, English"

This banner text can have markup.. web; books; video; audio; software; images; Toggle navigation

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