Photograph as originally submitted to this page in the Historical Marker Database www.HMdb.org. Click on photo to resize in browser. Scroll down to see metadata.
Tunnel Construction Technology Improves Marker
Photographer: Craig Doda
Taken: May 20, 2018
Caption: Tunnel Construction Technology Improves Marker
Submitted: January 20, 2021, by Craig Doda of Napoleon, Ohio.
Database Locator Identification Number: p564460
File Size: 1.846 Megabytes

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