Protecting Alarm-Circuit., patent, October 12, 1897; (https://texashistory.unt.edu/ark:/67531/metapth174764/m1/3/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Protecting Alarm-Circuit., patent, October 12, 1897; (https://texashistory.unt.edu/ark:/67531/metapth174764/m1/3/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .