Banker's Daily-Balance Index., patent, April 30, 1895; (https://texashistory.unt.edu/ark:/67531/metapth173979/m1/1/: accessed July 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .
Banker's Daily-Balance Index., patent, April 30, 1895; (https://texashistory.unt.edu/ark:/67531/metapth173979/m1/1/: accessed July 15, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; .