Metallic Mold for Concrete Walls Page: 1 of 6
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Metallic Mold for Concrete Walls, patent, April 12, 1921; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1257648/m1/1/: accessed June 22, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.