Switch Cord Plug, patent, April 28, 1908; (https://texashistory.unt.edu/ark:/67531/metapth513222/m1/1/: accessed June 21, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Switch Cord Plug, patent, April 28, 1908; (https://texashistory.unt.edu/ark:/67531/metapth513222/m1/1/: accessed June 21, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .