Automobile-Signal., patent, November 15, 1921; (https://texashistory.unt.edu/ark:/67531/metapth1258785/m1/1/: accessed June 10, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Automobile-Signal., patent, November 15, 1921; (https://texashistory.unt.edu/ark:/67531/metapth1258785/m1/1/: accessed June 10, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .