Car-Door., patent, June 12, 1894; (https://texashistory.unt.edu/ark:/67531/metapth173744/m1/1/: accessed July 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Car-Door., patent, June 12, 1894; (https://texashistory.unt.edu/ark:/67531/metapth173744/m1/1/: accessed July 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .