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- 1923.
- New Richmond Roller Mills.
- New Richmond Roller Mills, circa 1923.
- Norris Cotton Mills.
- Norris Cotton Mills, circa 1939.
- A Woodward Governor Company advertisement from 1914.
- Woodward factory photo of their new oil-pressure governor for turbine water wheels, circa 1914.
- Woodward Oil- Pressure Water Wheel Governor VR series, circa 1914.
- Bulletin number 14000.
- BULLETIN NUMBER 14022A.
- WOODWARD AIRCRAFT ENGINE CONTROL HISTORY.
- ENGINEERING MAGAZINE. MARCH 1905.
- ELETRICAL WORLD, CIRCA 1914.
- ELECTRICAL WORLD VOLUME 64, CIRCA 1914.
- Circa 1907.