Churn., patent, August 26, 1890; (https://texashistory.unt.edu/ark:/67531/metapth172459/m1/1/: accessed July 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Churn., patent, August 26, 1890; (https://texashistory.unt.edu/ark:/67531/metapth172459/m1/1/: accessed July 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .