Telephone Transmitter and Receiver, patent, June 30, 1903; (https://texashistory.unt.edu/ark:/67531/metapth511280/m1/3/: accessed July 5, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .
Telephone Transmitter and Receiver, patent, June 30, 1903; (https://texashistory.unt.edu/ark:/67531/metapth511280/m1/3/: accessed July 5, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .