Automatic Stopping Mechanism for Trains, patent, October 25, 1910; (https://texashistory.unt.edu/ark:/67531/metapth511626/m1/1/: accessed April 27, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Automatic Stopping Mechanism for Trains, patent, October 25, 1910; (https://texashistory.unt.edu/ark:/67531/metapth511626/m1/1/: accessed April 27, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .