Indicator For Clocks or Watches, patent, November 17, 1908; (https://texashistory.unt.edu/ark:/67531/metapth508391/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Indicator For Clocks or Watches, patent, November 17, 1908; (https://texashistory.unt.edu/ark:/67531/metapth508391/m1/1/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .