Escapement for Timekeepers., patent, October 12, 1858; (https://texashistory.unt.edu/ark:/67531/metapth165062/m1/3/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Escapement for Timekeepers., patent, October 12, 1858; (https://texashistory.unt.edu/ark:/67531/metapth165062/m1/3/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .