Air-Valve Cage for Air-Brake Pumps, patent, February 16, 1909; (https://texashistory.unt.edu/ark:/67531/metapth510346/m1/1/: accessed April 23, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Air-Valve Cage for Air-Brake Pumps, patent, February 16, 1909; (https://texashistory.unt.edu/ark:/67531/metapth510346/m1/1/: accessed April 23, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .