Gate-Operating Mechanism, patent, December 12, 1911; (https://texashistory.unt.edu/ark:/67531/metapth513285/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Gate-Operating Mechanism, patent, December 12, 1911; (https://texashistory.unt.edu/ark:/67531/metapth513285/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .