Gradometer.
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patent as a primary source within our collections. Researchers, educators, and students may find this patent useful in their work.
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Gradometer., patent, May 17, 1921; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1259571/: accessed July 6, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.