Color photograph of Richard DeWall.

Richard DeWall

Photograph of Richard DeWall. From the Pioneers of the Medical Device Industry in Minnesota Oral History Project.

Rochester cyclone.

Rochester cyclone.

Rochester cyclone. Photo by Charles A. Tenney, August 21, 1883.

Rocks dropped from loaded barges, Duluth ship canal

Rocks dropped from loaded barges, Duluth ship canal

Rocks dropped from loaded barges into the water, Duluth ship canal c.1900.

Black and white photograph of Rolette (standing) with business associates Henry Hastings Sibley (right), and possibly Franklin Steele (left), c.1857.

Rolette (standing) with Henry Hastings Sibley (right) and possibly Franklin Steele (left)

Rolette (standing) with business associates Henry Hastings Sibley (right), and possibly Franklin Steele (left), c.1857.

Roller coaster, Wonderland Amusement Park, Minneapolis.

Roller coaster, Wonderland Amusement Park, Minneapolis.

The Scenic Railway (a roller coaster) at Wonderland, from above, c. 1906.

Ronning Ensilage Harvester (front)

Ronning Ensilage Harvester (front)

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)

Ronning Ensilage Harvester (side)

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

Ronning road planer prototype

Ronning road planer prototype

Pages

Subscribe to Multimedia