Fireproof Swing and Ventilator. Page: 1 of 5
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Fireproof Swing and Ventilator., patent, October 2, 1917; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth854042/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.