The 1904 World's Fair, St. Louis, Missouri: hydraulic machinery produced by the Stillwell-Beirce and Smith-Vaile Company of Dayton, Ohio. Photograph, 1904.

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The 1904 World's Fair, St. Louis, Missouri: hydraulic machinery produced by the Stillwell-Beirce and Smith-Vaile Company of Dayton, Ohio. Photograph, 1904. Wellcome Collection. Public Domain Mark. Source: Wellcome Collection.