Shaft and Pulley Collar., patent, May 14, 1907; (https://texashistory.unt.edu/ark:/67531/metapth514355/m1/1/: accessed April 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Shaft and Pulley Collar., patent, May 14, 1907; (https://texashistory.unt.edu/ark:/67531/metapth514355/m1/1/: accessed April 16, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .