Improvement in Lever-Powers., patent, September 23, 1879; (https://texashistory.unt.edu/ark:/67531/metapth169896/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Improvement in Lever-Powers., patent, September 23, 1879; (https://texashistory.unt.edu/ark:/67531/metapth169896/m1/1/: accessed July 17, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .