Coupling-Pin., patent, July 23, 1907; (https://texashistory.unt.edu/ark:/67531/metapth513944/m1/1/: accessed July 6, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Coupling-Pin., patent, July 23, 1907; (https://texashistory.unt.edu/ark:/67531/metapth513944/m1/1/: accessed July 6, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .