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images images of crushing grinding circuit fiber serpentine asbestos

images images of crushing grinding circuit fiber serpentine asbestos

Individual exposures were estimated using dust measurements available for the period 195677 Levels of exposure were estimated for the following operations milling mixing machine line sawing and grinding Asbestos concentrations ranged from 1563 fmL in 1956 to 0350 fmL in 1969 and to 0917 fmL in 1975

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