Railroad Nut-Wrench., patent, March 2, 1886; (https://texashistory.unt.edu/ark:/67531/metapth171202/m1/1/: accessed May 8, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Railroad Nut-Wrench., patent, March 2, 1886; (https://texashistory.unt.edu/ark:/67531/metapth171202/m1/1/: accessed May 8, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .