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BLIND-STOP, patent, August 18, 1903; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth508383/m1/1/?q=%22Science%20and%20Technology%20-%20Tools%22: accessed May 20, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.