Photograph of Richard DeWall. From the Pioneers of the Medical Device Industry in Minnesota Oral History Project.
Rochester cyclone. Photo by Charles A. Tenney, August 21, 1883.
Rocks dropped from loaded barges into the water, Duluth ship canal c.1900.
Rolette (standing) with business associates Henry Hastings Sibley (right), and possibly Franklin Steele (left), c.1857.
The roller coaster crew, c. 1906, with a view of the tracks.
Wildwood Amusement Park, c.1915.
The Scenic Railway (a roller coaster) at Wonderland, from above, c. 1906.
Ronning Ensilage Harvester (front) patented by Andrean and Adolph Ronning of Minneapolis in 1915. Manufactured by the American Harvester Company, also of Minneapolis.
Ronning Ensilage Harvester (side) patented by Andrean and Adolph Ronning of Minneapolis in 1915. Manufactured by the American Harvester Company, also of Minneapolis.
Ronning road planer prototype
Made possible by the Arts and Cultural Heritage Fund through the vote of Minnesotans on November 4, 2008. Administered by the Minnesota Historical Society.
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