Thompson, William H. & Thompson, J. D. Prepay Time-Controlled-Service Apparatus., patent, May 11, 1920; (https://texashistory.unt.edu/ark:/67531/metapth1257312/m1/3/: accessed July 6, 2024), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu.; .

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