Thill-Coupling., patent, December 27, 1892; (https://texashistory.unt.edu/ark:/67531/metapth173269/m1/1/: accessed June 21, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Thill-Coupling., patent, December 27, 1892; (https://texashistory.unt.edu/ark:/67531/metapth173269/m1/1/: accessed June 21, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .