Toy., patent, March 20, 1906; (https://texashistory.unt.edu/ark:/67531/metapth513076/m1/1/: accessed June 19, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Toy., patent, March 20, 1906; (https://texashistory.unt.edu/ark:/67531/metapth513076/m1/1/: accessed June 19, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .