A National Archives Foundation educational resource using primary sources from the National Archives
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This primary source comes from the Records of the Patent and Trademark Office.
National Archives Identifier: 7268013
Full Citation: Patent Drawing of Willis H. Carrier’s Apparatus for Treating Air; 1/2/1906; Patent 808897; 808897 – Apparatus for Treating Air – Willis H. Carrier; Selected Patent Files, 1840 – 2005; Records of the Patent and Trademark Office, Record Group 241; National Archives at College Park, College Park, MD. [Online Version, https://docsteach.org/document/patent-treating-air/, April 30, 2026]
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