Door Check., patent, May 25, 1886; (https://texashistory.unt.edu/ark:/67531/metapth171268/m1/1/: accessed June 21, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Door Check., patent, May 25, 1886; (https://texashistory.unt.edu/ark:/67531/metapth171268/m1/1/: accessed June 21, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .