Home / HISTORICAL WATER POWER ENGINEERING. 140
Creation date / 2017
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- Elmer E. Woodward's state-of-the-art oil pressure relay valve water wheel governors patented in 1912.
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- Another vintage Elmer Woodward ad from 1905.
- Elmer E. Woodward's new water wheel governor from three patents.
- Elmer E. Woodward's state-of-the-art mechanical compensating type water wheel governor.