Folding Step for Public Carriers, patent, December 26, 1905; (https://texashistory.unt.edu/ark:/67531/metapth512739/m1/1/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Folding Step for Public Carriers, patent, December 26, 1905; (https://texashistory.unt.edu/ark:/67531/metapth512739/m1/1/: accessed July 2, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .