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- A vintage Water Wheel Manufacturing History Project.
- JAMES LEFFEL LETTERHEAD, CIRCA 1944.
- The Woodward Company and the James Leffel & Company are still in business in the year 2020. History in the making!
- THE JAMES LEFFEL COMPANY, CIRCA 1944.
- Elmer Woodward's first Hydraulic Turbine Water Wheel Governor.
- 3,208,218. Page 5, filed Sept. 25, 1963.
- 3,142,154. Page 7.
- 3,142,154. Page 10.
- 3,142,154. Page 13.
- 3,208,218. Page 6.
- 3,142,154. Page 4.
- 3,142,154. Page 6.
- 3,142,154. Page 5.
- 3,142,154. Page 9.
- 3,142,154. Page 2.