Knee-Spreader., patent, February 6, 1900; (https://texashistory.unt.edu/ark:/67531/metapth513565/m1/1/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Knee-Spreader., patent, February 6, 1900; (https://texashistory.unt.edu/ark:/67531/metapth513565/m1/1/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .