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Woman working with unfired clay tiles in a pottery factory with exhaust ventilation

Woman working as a remover attends unfired clay tiles on a conveyor equipped with exhaust ventilation in a West Virginia pottery factory. (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.)