Automatic Railway Switch, patent, December 20, 1904; (https://texashistory.unt.edu/ark:/67531/metapth512547/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Automatic Railway Switch, patent, December 20, 1904; (https://texashistory.unt.edu/ark:/67531/metapth512547/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .