Holder., patent, July 2, 1918; (https://texashistory.unt.edu/ark:/67531/metapth1256723/m1/1/: accessed June 30, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Holder., patent, July 2, 1918; (https://texashistory.unt.edu/ark:/67531/metapth1256723/m1/1/: accessed June 30, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .