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- Governor Definitions copied from Irl C. Martins history book.
- Governor Definitions.
- Elmer E. Woodward's new water wheel governor from three patents.
- Elmer E. Woodward's state-of-the-art mechanical compensating type water wheel governor.
- Another vintage Elmer Woodward ad from 1905.
- Data from Water Power Engineering, circa 1908.
- Elmer E. Woodward's state-of-the-art oil pressure relay valve water wheel governor patented in 1912.
- Data from Water Power Engineering, circa 1908.
- Simplify Your Life with Woodward Energy Controls.
- JAMES LEFFEL LETTERHEAD, CIRCA 1944.
- Woodward Governor Company's shop order #1845, circa 1909.
- Elmer E Woodward's new hydrauic governor for turbine water wheels.
- The new Woodward Hydraulic Governor, circa 1914.
- Another example of a blueprint of a mechanical water wheel governor Size D series 3, circa 1926.
- READING SHOP BLUEPRINT HISTORY.