Strain-Relieving Attachment for Telegraph-Keys.
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Strain-Relieving Attachment for Telegraph-Keys., patent, March 24, 1908; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth510992/: accessed July 11, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.