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Steam Boiler Furnace, patent, November 15, 1904; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth511471/m1/1/: accessed July 5, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.