This new type of oil pressure relay valve water wheel governor was filed for a patented by Elmer E. Woodward under the patent number 1,106,434 in 1912 and granted in 1914.
This new type of oil pressure relay valve water wheel governor was filed for a patented by Elmer E. Woodward under the patent number 1,106,434 in 1912 and granted in 1914.