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- James Leffel's tombstone.
- James Leffel's tombstone showing his patented turbine water wheel.
- James Leffel's tombstone.
- Rest in peace James Leffel.
- Circa 1938.
- A James Leffel & Company letter to Woodward, circa 1937.
- A James Leffel & Company letter to Woodward, circa 1919.
- A James Leffel & Company letter, circa 1870.
- Application of a Woodward Standard Size 3 Turbine Water Wheel Governor.
- Amos Woodward letter to the James Leffel & Company, circa 1887.
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