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- Effigy mound history in Madison, Wisconsin.
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- Prime Mover Control March 1, 1945.
- Elmer Ellsworth Woodward, a pioneer in the manufacturing of Prime Mover Controls.
- Elmer Woodward's first diesel engine governor system patented in 1933.
- A Chandler Evans Company jet engine governor fuel control system.
- A Chandler Evans Company jet engine governor fuel control system.
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