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- Woodward PM type engine governor application history.
- 2 page
- The Water Power Situation in Wisconsin.
- JAMES LEFFEL & COMPANY CATALOGUE, CIRCA 1897.
- An excellent example of an early Woodward turbine water wheel governor application.
- The James Leffel & Company's factory history.
- A Rockford, Illinois map showing dwellings built before 1890.
- A slice of diesel locomotve history in color.
- A slice of American Railroad history.
- A slice of diesel locomotve history in color.
- First generation diesel locomotive history in color.
- A Woodward governor connected to a Victor turbine.
- Elmer Woodward's vertical compensating type governor connected to a Victor turbine.
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- A schematic drawing of a Woodward compensating type water wheel governor.