Mold and Angle-Piece Used in Constructing Concrete Walls
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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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Mold and Angle-Piece Used in Constructing Concrete Walls, patent, April 13, 1886; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth171237/: accessed July 10, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.