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Nearly 3,000 illustrations, including video clips of neurologic disorders.
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Feed floor

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"An excellent example of a feed floor, such as is found in five smelters, although only three are as good as this. The openings to the furnaces may be seen in the runway for the cars. The mechanician controls from a distance the discharing of the cars." (Source: Hamilton A. Lead poisoning in the smelting and refining of lead. Industrial Accidents and Hygiene Series No. 4. Bulletin of the U.S. Bureau of Labor Statistics 1914a;141:1-97. Public domain.)