Improvement in Permutation Locks., patent, September 27, 1870; (https://texashistory.unt.edu/ark:/67531/metapth165253/m1/3/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Improvement in Permutation Locks., patent, September 27, 1870; (https://texashistory.unt.edu/ark:/67531/metapth165253/m1/3/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .