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

1106434 2.jpg 110ThumbnailsRelay valve oil pressure water wheel governor patent 1,106,434.110ThumbnailsRelay valve oil pressure water wheel governor patent 1,106,434.110ThumbnailsRelay valve oil pressure water wheel governor patent 1,106,434.110ThumbnailsRelay valve oil pressure water wheel governor patent 1,106,434.