Spark Plug for Internal-Combustion Engines, patent, January 18, 1915; (https://texashistory.unt.edu/ark:/67531/metapth858322/m1/1/: accessed July 6, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Spark Plug for Internal-Combustion Engines, patent, January 18, 1915; (https://texashistory.unt.edu/ark:/67531/metapth858322/m1/1/: accessed July 6, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .