Telephone Attachment. Page: 2 of 5
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Telephone Attachment., patent, November 23, 1909; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth508234/m1/2/: accessed July 18, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.