Exhaust-Steam-Actuating Damper-Regulator., patent, July 10, 1917; (https://texashistory.unt.edu/ark:/67531/metapth853597/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Exhaust-Steam-Actuating Damper-Regulator., patent, July 10, 1917; (https://texashistory.unt.edu/ark:/67531/metapth853597/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .