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Reference the current page of this Patent.
Grapple., patent, April 26, 1921; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1257834/m1/1/?rotate=90: accessed July 8, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.