Press for Forming Hollow Articles, patent, July 13, 1909; (https://texashistory.unt.edu/ark:/67531/metapth508265/m1/1/: accessed August 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Press for Forming Hollow Articles, patent, July 13, 1909; (https://texashistory.unt.edu/ark:/67531/metapth508265/m1/1/: accessed August 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .