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Bed-Spring-Coiling Machine, patent, January 10, 1893; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth173283/m1/2/: accessed June 27, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.