Knee-Pad, patent, May 3, 1915; (https://texashistory.unt.edu/ark:/67531/metapth858018/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Knee-Pad, patent, May 3, 1915; (https://texashistory.unt.edu/ark:/67531/metapth858018/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .