Door Check., patent, August 2, 1887; (https://texashistory.unt.edu/ark:/67531/metapth171602/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Door Check., patent, August 2, 1887; (https://texashistory.unt.edu/ark:/67531/metapth171602/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .