Elevator, patent, April 18, 1911; (https://texashistory.unt.edu/ark:/67531/metapth514076/m1/1/: accessed April 24, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Elevator, patent, April 18, 1911; (https://texashistory.unt.edu/ark:/67531/metapth514076/m1/1/: accessed April 24, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .