- The first Woodward oil pressure hydraulic water wheel governor from patent number 1,106,434.
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- A vintage Hydro Power Industry project.
- Largest Impulse-Type Waterwheels Feature High-Head Turbines.
- A vintage Hydro Power Industry advertisement project.
- A Hydro Power Industry history project.
- A Hydro Power Industry history project.
- ALLIS-CHALMERS MANUFACTURING COMPANY HISTORY.