Electric-Current Controller., patent, April 18, 1899; (https://texashistory.unt.edu/ark:/67531/metapth510467/m1/1/: accessed June 26, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Electric-Current Controller., patent, April 18, 1899; (https://texashistory.unt.edu/ark:/67531/metapth510467/m1/1/: accessed June 26, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .