Station-Indicator., patent, September 6, 1898; (https://texashistory.unt.edu/ark:/67531/metapth514321/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Station-Indicator., patent, September 6, 1898; (https://texashistory.unt.edu/ark:/67531/metapth514321/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .