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Cotton-Chopper., patent, March 31, 1908; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth513337/m1/1/?q=%22Science+and+Technology%22: accessed May 30, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.