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- Elmer Woodward hydraulic(oil pressure) turbine water wheel governor patent.
- Relay valve oil pressure water wheel governor patent 1,106,434.
- Elmer E. Woodward's first oil pressure(hydraulic) water wheel governor.
- 1106434. Page 3.
- 1106434. Page 4.
- 1106434. Page 5.
- 11064341 sheet 1 of 2.
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