Automatic Safety Attachment for Air-Brakes, patent, April 11, 1911; (https://texashistory.unt.edu/ark:/67531/metapth512325/m1/1/: accessed July 13, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Automatic Safety Attachment for Air-Brakes, patent, April 11, 1911; (https://texashistory.unt.edu/ark:/67531/metapth512325/m1/1/: accessed July 13, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .