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Balance Staff and Wheel for Watches, patent, May 18, 1880; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth169991/m1/1/: accessed May 7, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.