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Elmer E. Woodward's state-of-the-art oil pressure relay valve water wheel governor patented in 1912.
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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.
- Created on
- Thursday 6 July 2017
- Posted on
- Thursday 6 July 2017
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