Surface-Treating Machine., patent, October 19, 1920; (https://texashistory.unt.edu/ark:/67531/metapth1258620/m1/1/: accessed June 27, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Surface-Treating Machine., patent, October 19, 1920; (https://texashistory.unt.edu/ark:/67531/metapth1258620/m1/1/: accessed June 27, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .