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.
Creation and Development of 3M marker
Photographer: McGhiever
Taken: June 26, 2019
Caption: Creation and Development of 3M marker
Submitted: June 14, 2020, by McGhiever of Minneapolis, Minnesota.
Database Locator Identification Number: p526066
File Size: 6.748 Megabytes

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