Device for Controlling Electric Current.
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Device for Controlling Electric Current., patent, January 28, 1919; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1257150/: accessed July 11, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.