Railroad-Switch., patent, March 12, 1907; (https://texashistory.unt.edu/ark:/67531/metapth513079/m1/1/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Railroad-Switch., patent, March 12, 1907; (https://texashistory.unt.edu/ark:/67531/metapth513079/m1/1/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .