Penman's Arm Rest., patent, June 14, 1887; (https://texashistory.unt.edu/ark:/67531/metapth171552/m1/1/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Penman's Arm Rest., patent, June 14, 1887; (https://texashistory.unt.edu/ark:/67531/metapth171552/m1/1/: accessed June 20, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .