Battle Telephone System - Switchboard Type, Isometric Wiring Diagram
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Battle Telephone System - Switchboard Type, Isometric Wiring Diagram, technical drawing, July 30, 1943; (https://texashistory.unt.edu/ark:/67531/metapth887368/: accessed June 6, 2024), University of North Texas Libraries, The Portal to Texas History, https://texashistory.unt.edu; crediting Texas Parks & Wildlife Department.