Switch-Stand, patent, November 12, 1912; (https://texashistory.unt.edu/ark:/67531/metapth510335/m1/1/: accessed April 25, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Switch-Stand, patent, November 12, 1912; (https://texashistory.unt.edu/ark:/67531/metapth510335/m1/1/: accessed April 25, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .