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Man trimming unfired clay cups in a pottery factory

Man trimming greenware (unfired clay) cups in a West Virginia pottery factory. Note the turnings produced by cup turning which often fall to the floor, dry, and are ground into dust. (Source: CDC/Barbara Jenkins, NIOSH, 1936. Flinn RH. Neal PA, Reinhart WH, Dallavalle JM. Fulton WB, Dooley AE. Chronic manganese poisoning in an ore-crushing mill. Public Health Bulletin 1940;247:1-77. Public Health Image Library, Centers for Disease Control and Prevention, Atlanta, Georgia. Public domain.)

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