Mail-Bag Fastener., patent, July 16, 1907; (https://texashistory.unt.edu/ark:/67531/metapth508357/m1/1/: accessed July 5, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Mail-Bag Fastener., patent, July 16, 1907; (https://texashistory.unt.edu/ark:/67531/metapth508357/m1/1/: accessed July 5, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .