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Woman fettling unfired clayware over down-draft ventilation in a pottery factory

Woman fettling (trimming) greenware (unfired clayware) over down-draft ventilation in a West Virginia pottery factory. Note the dust produced in this operation. (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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