General Neurology
Locked-in syndrome
May. 14, 2024
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Railroad car unloader shovels finely ground quartz while investigator collects dust samples
A railroad car unloader shovels finely ground quartz into a wheelbarrow at a West Virginia pottery factory, while a US Public Health Service investigator collects dust samples in his breathing zone with an impringer. (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.)