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Valve Stem Packing, patent, August 25, 1903; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth513762/m1/1/: accessed July 1, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.