Air-Pipe Coupling., patent, May 2, 1893; (https://texashistory.unt.edu/ark:/67531/metapth173412/m1/1/: accessed May 21, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Air-Pipe Coupling., patent, May 2, 1893; (https://texashistory.unt.edu/ark:/67531/metapth173412/m1/1/: accessed May 21, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .