Listing-Machine., patent, September 19, 1899; (https://texashistory.unt.edu/ark:/67531/metapth508595/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Listing-Machine., patent, September 19, 1899; (https://texashistory.unt.edu/ark:/67531/metapth508595/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .