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Pump-Piston., patent, May 4, 1920; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1259313/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.