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generally of secondary importance as far as airborne dust in the workplace is concerned. materials such as rockwool or stonewool and glass wool, as well as . breakdown process such as grinding, cutting, drilling, crushing, explosion, pounds, manganese, cyanamide, phthalic anhydride, dusts of



A crusher is a machine designed to reduce large rocks into smaller rocks, gravel, or rock dust. . But Darby would change the world in several key ways. to reduce particle size enough so that the material can be processed into finer particles in a grinder. . Gyratory crushers can be used for primary or secondary crushing.


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