Locking-Bolt for Guards to Openings., patent, March 31, 1908; (https://texashistory.unt.edu/ark:/67531/metapth509841/m1/1/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Locking-Bolt for Guards to Openings., patent, March 31, 1908; (https://texashistory.unt.edu/ark:/67531/metapth509841/m1/1/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .