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Elmer Woodward hydraulic(oil pressure) turbine water wheel governor patent.

1106434 2.jpg ThumbnailsRelay valve oil pressure water wheel governor patent 1,106,434.ThumbnailsRelay valve oil pressure water wheel governor patent 1,106,434.ThumbnailsRelay valve oil pressure water wheel governor patent 1,106,434.ThumbnailsRelay valve oil pressure water wheel governor patent 1,106,434.