Valve-Closure for Ventilators Page: 1 of 3
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Valve-Closure for Ventilators, patent, December 20, 1917; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1256802/m1/1/: accessed June 21, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu.; crediting UNT Libraries Government Documents Department.