Mail-Transferring Apparatus. Page: 1 of 3
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Mail-Transferring Apparatus., patent, April 20, 1920; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth1258912/m1/1/: accessed May 21, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.