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Data from Water Power Engineering, circa 1908.

a27287e16bb48c35c6c7938278842dbf.jpg Another vintage Elmer Woodward ad from 1905.ThumbnailsElmer E. Woodward's state-of-the-art oil pressure relay valve water wheel governor patented in 1912.Another vintage Elmer Woodward ad from 1905.ThumbnailsElmer E. Woodward's state-of-the-art oil pressure relay valve water wheel governor patented in 1912.Another vintage Elmer Woodward ad from 1905.ThumbnailsElmer E. Woodward's state-of-the-art oil pressure relay valve water wheel governor patented in 1912.
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2017:07:06 15:02:46

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