Crown Setter, patent, July 6, 1920; (https://texashistory.unt.edu/ark:/67531/metapth1258709/m1/1/: accessed July 3, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Crown Setter, patent, July 6, 1920; (https://texashistory.unt.edu/ark:/67531/metapth1258709/m1/1/: accessed July 3, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .