Cotton-Cupper, patent, October 1, 1889; (https://texashistory.unt.edu/ark:/67531/metapth172171/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Cotton-Cupper, patent, October 1, 1889; (https://texashistory.unt.edu/ark:/67531/metapth172171/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .