Expanding Hub., patent, May 17, 1898; (https://texashistory.unt.edu/ark:/67531/metapth508665/m1/4/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Expanding Hub., patent, May 17, 1898; (https://texashistory.unt.edu/ark:/67531/metapth508665/m1/4/: accessed July 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .