- Aermotor Windmill Company - see Nimrod or Rapid River for example
- Bethlehem Steel - see Norris for example
- International Derrick - see Ball Bluff as example
- Jones & Laughlin
- Pittsburg - Des Moines Company - see Ash River as example
- McClintic Marshall Corp - see Kabetogama as example
- Woodmanse - see Elephant Lake as example
The "windmill" tower was a windmill frame with something for the ranger to stand in or on.
Schley tower, Cass County
Note similarity to farm windmill, Clearwater County
This work is licensed under a Creative Commons Attribution-NoDerivs 3.0 Unported License.