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historicalmarkerproject/markers/HMPQW_navajo-bridge-erection-toggle-screw-navajo-bridge_Marble-Canyon-AZ.html
This Erection Toggle Screw was used in the construction of the historic Navajo Bridge to maintain bridge vertical elevations and as a means of lowering bridge sections in place. [Plaque Mounted on Bridge]:State of ArizonaNavajo BridgeArch 616 f…
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