Time-Recorder., patent, April 12, 1898; (https://texashistory.unt.edu/ark:/67531/metapth512064/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Time-Recorder., patent, April 12, 1898; (https://texashistory.unt.edu/ark:/67531/metapth512064/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .