Combination Motion-Picture and Sound-Reproducing Mechanism.
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Combination Motion-Picture and Sound-Reproducing Mechanism., patent, June 4, 1918; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1257948/: accessed July 4, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.