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Elmer E. Woodward's state-of-the-art oil pressure relay valve water wheel governors patented in 1912.

WGC 21.jpg Oldest known Woodward catalog from the Water Power District on Race StreetThumbnailsElmer E. Woodward's state-of-the-art oil pressure relay valve water wheel governor patented in 1912.Oldest known Woodward catalog from the Water Power District on Race StreetThumbnailsElmer E. Woodward's state-of-the-art oil pressure relay valve water wheel governor patented in 1912.Oldest known Woodward catalog from the Water Power District on Race StreetThumbnailsElmer E. Woodward's state-of-the-art oil pressure relay valve water wheel governor patented in 1912.Oldest known Woodward catalog from the Water Power District on Race StreetThumbnailsElmer E. Woodward's state-of-the-art oil pressure relay valve water wheel governor patented in 1912.
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2017:06:28 19:36:54

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