Apparatus for Building Concrete Structures.
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Apparatus for Building Concrete Structures., patent, November 14, 1922; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1258468/: accessed June 5, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.