Knee-Protector., patent, July 15, 1919; (https://texashistory.unt.edu/ark:/67531/metapth1256440/m1/1/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Knee-Protector., patent, July 15, 1919; (https://texashistory.unt.edu/ark:/67531/metapth1256440/m1/1/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .