Automatic Electric Switch, patent, December 15, 1903; (https://texashistory.unt.edu/ark:/67531/metapth509021/m1/1/: accessed April 19, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Automatic Electric Switch, patent, December 15, 1903; (https://texashistory.unt.edu/ark:/67531/metapth509021/m1/1/: accessed April 19, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .