AIR-BREAK SIGNALING AND RELEASEING DEVICE.
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AIR-BREAK SIGNALING AND RELEASEING DEVICE., patent, November 4, 1902; [Washington D.C.]. (https://texashistory.unt.edu/ark:/67531/metapth512580/: accessed May 26, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting UNT Libraries Government Documents Department.