Safety Device for Elevators.
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Safety Device for Elevators., patent, May 15, 1917; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth860097/: accessed May 2, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.