Method of Marking the Keys of Key-Boards for Musical Instruments
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Method of Marking the Keys of Key-Boards for Musical Instruments, patent, June 29, 1880; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth170008/: accessed June 19, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.