Seal-Lock., patent, April 27, 1909; (https://texashistory.unt.edu/ark:/67531/metapth512742/m1/1/: accessed April 25, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Seal-Lock., patent, April 27, 1909; (https://texashistory.unt.edu/ark:/67531/metapth512742/m1/1/: accessed April 25, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .